Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 3795 insertions, 0 deletions

diff --git a/src/lib/testutils/Makefile.am b/src/lib/testutils/Makefile.am
new file mode 100644
index 0000000..03d78fb
--- /dev/null
+++ b/src/lib/testutils/Makefile.am
@@ -0,0 +1,30 @@
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+
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+
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+libkea_testutils_la_SOURCES += threaded_test.cc threaded_test.h
+libkea_testutils_la_SOURCES += unix_control_client.cc unix_control_client.h
+libkea_testutils_la_SOURCES += user_context_utils.cc user_context_utils.h
+libkea_testutils_la_SOURCES += gtest_utils.h
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+libkea_testutils_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+endif
+
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+
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+
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diff --git a/src/lib/testutils/Makefile.in b/src/lib/testutils/Makefile.in
new file mode 100644
index 0000000..d7d2ce6
--- /dev/null
+++ b/src/lib/testutils/Makefile.in
@@ -0,0 +1,824 @@
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+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/libkea_testutils_la-io_utils.Plo
+	-rm -f ./$(DEPDIR)/libkea_testutils_la-log_utils.Plo
+	-rm -f ./$(DEPDIR)/libkea_testutils_la-test_to_element.Plo
+	-rm -f ./$(DEPDIR)/libkea_testutils_la-threaded_test.Plo
+	-rm -f ./$(DEPDIR)/libkea_testutils_la-unix_control_client.Plo
+	-rm -f ./$(DEPDIR)/libkea_testutils_la-user_context_utils.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/testutils/README b/src/lib/testutils/README
new file mode 100644
index 0000000..126f1b8
--- /dev/null
+++ b/src/lib/testutils/README
@@ -0,0 +1,2 @@
+Here is some code used by more than one test. No code is used for Kea
+itself, only for testing.
diff --git a/src/lib/testutils/dhcp_test_lib.sh.in b/src/lib/testutils/dhcp_test_lib.sh.in
new file mode 100644
index 0000000..6260d2d
--- /dev/null
+++ b/src/lib/testutils/dhcp_test_lib.sh.in
@@ -0,0 +1,1176 @@
+#!/bin/sh
+
+# Copyright (C) 2014-2023 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+
+# shellcheck disable=SC2034
+# SC2034: ... appears unused. Verify use (or export if used externally).
+
+# shellcheck disable=SC2039
+# SC2039: In POSIX sh, 'local' is undefined.
+
+# shellcheck disable=SC2153
+# SC2153: Possible misspelling: ... may not be assigned, but ... is.
+
+# shellcheck disable=SC2154
+# SC2154: bin_path is referenced but not assigned.
+
+# shellcheck disable=SC3043
+# SC3043: In POSIX sh, 'local' is undefined.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include XML reporting library.
+. "@abs_top_builddir@/src/lib/testutils/xml_reporting_test_lib.sh"
+
+prefix="@prefix@"
+
+# Expected version
+EXPECTED_VERSION="@PACKAGE_VERSION@"
+
+# Kea environment variables for shell tests.
+# KEA_LOGGER_DESTINATION is set per test with set_logger.
+export KEA_LFC_EXECUTABLE="@abs_top_builddir@/src/bin/lfc/kea-lfc"
+export KEA_LOCKFILE_DIR="@abs_top_builddir@/test_lockfile_dir"
+export KEA_PIDFILE_DIR="@abs_top_builddir@/test_pidfile_dir"
+KEA_DHCP4_LOAD_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp4/tests/load_marker.txt"
+KEA_DHCP4_UNLOAD_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp4/tests/unload_marker.txt"
+KEA_DHCP4_SRV_CONFIG_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp4/tests/srv_config_marker_file.txt"
+KEA_DHCP6_LOAD_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp6/tests/load_marker.txt"
+KEA_DHCP6_UNLOAD_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp6/tests/unload_marker.txt"
+KEA_DHCP6_SRV_CONFIG_MARKER_FILE="@abs_top_builddir@/src/bin/dhcp6/tests/srv_config_marker_file.txt"
+
+# A list of Kea processes, mainly used by the cleanup functions.
+KEA_PROCS="kea-dhcp4 kea-dhcp6 kea-dhcp-ddns kea-ctrl-agent"
+
+### Colors ###
+
+if test -t 1; then
+  green='\033[92m'
+  red='\033[91m'
+  reset='\033[0m'
+fi
+
+### Logging functions ###
+
+# Prints error message.
+test_lib_error() {
+    local s="${1-}"             # Error message.
+    local no_new_line="${2-}"   # If specified, the message is not terminated
+                                # with new line.
+    printf "ERROR/test_lib: %s" "${s}"
+    if [ -z "${no_new_line}" ]; then
+        printf '\n'
+    fi
+}
+
+# Prints info message.
+test_lib_info() {
+    local s="${1-}"             # Info message.
+    local no_new_line="${2-}"   # If specified, the message is not terminated
+                                # with new line.
+    printf "INFO/test_lib: %s" "${s}"
+    if [ -z "${no_new_line}" ]; then
+        printf '\n'
+    fi
+}
+
+### Assertions ###
+
+# Assertion that checks if two numbers are equal.
+# If numbers are not equal, the mismatched values are presented and the
+# detailed error is printed. The detailed error must use the printf
+# formatting like this:
+#    "Expected that some value 1 %d is equal to some other value %d".
+assert_eq() {
+    val1=${1}           # Reference value
+    val2=${2}           # Tested value
+    detailed_err=${3-}  # Optional detailed error format string
+    # If nothing found, present an error an exit.
+    if [ "${val1}" -ne "${val2}" ]; then
+        printf 'Assertion failure: %s != %s, expected %s, got %s\n' \
+            "${val1}" "${val2}" "${val1}" "${val2}"
+        # shellcheck disable=SC2059
+        # SC2059: Don't use variables in the printf format string. Use printf '..%s..' "$foo"
+        ERROR=$(printf "${detailed_err}" "${val1}" "${val2}")
+        printf '%s\n%s\n' "${ERROR}" "${OUTPUT}" >&2
+        clean_exit 1
+    fi
+}
+
+# Assertion that checks that two strings are equal.
+# If strings are not equal, the mismatched values are presented and the
+# detailed error is printed. The detailed error must use the printf
+# formatting like this:
+#    "Expected that some value 1 %d is equal to some other value %d".
+assert_str_eq() {
+    val1=${1}           # Reference value
+    val2=${2}           # Tested value
+    detailed_err=${3-}  # Optional detailed error format string
+    # If nothing found, present an error an exit.
+    if [ "${val1}" != "${val2}" ]; then
+        printf 'Assertion failure: %s != %s, expected "%s", got "%s"\n' \
+            "${val1}" "${val2}" "${val1}" "${val2}"
+        # shellcheck disable=SC2059
+        # SC2059: SC2059: Don't use variables in the printf format string. Use printf '..%s..' "$foo".
+        ERROR=$(printf "${detailed_err}" "${val1}" "${val2}")
+        printf '%s\n%s\n' "${ERROR}" "${OUTPUT}" >&2
+        clean_exit 1
+    fi
+}
+
+# Assertion that checks that two strings are NOT equal.
+# If strings are equal, the mismatched values are presented and the
+# optional detailed error, if any, is printed.
+assert_str_neq() {
+    reference=${1}        # Reference value
+    tested=${2}           # Tested value
+    detailed_error=${3-}  # Optional detailed error format string
+    if test "${reference}" = "${tested}"; then
+        printf 'Assertion failure: expected different strings, but '
+        printf 'both variables have the value "%s".\n' "${reference}"
+        printf '%s\n%s\n' "${detailed_error}" "${OUTPUT}" >&2
+        clean_exit 1
+    fi
+}
+
+# Assertion that checks if one string contains another string.
+# If assertion fails, both strings are displayed and the detailed
+# error is printed. The detailed error must use the printf formatting
+# like this:
+#    "Expected some string to contain this string: %s".
+assert_string_contains() {
+    pattern="${1}"      # Substring or awk pattern
+    text="${2}"         # Text to be searched for substring
+    detailed_err="${3}" # Detailed error format string
+    # Search for a pattern
+    match=$( printf "%s" "${text}" | awk /"${pattern}"/ )
+    # If nothing found, present an error and exit.
+    if [ -z "${match}" ]; then
+        ERROR=$(printf \
+"Assertion failure:
+\"%s\"
+
+does not contain pattern:
+\"%s\"
+
+${detailed_err}
+" "${text}" "${pattern}" "${pattern}")
+        printf '%s\n%s\n' "${ERROR}" "${OUTPUT}" >&2
+        clean_exit 1
+    fi
+}
+
+# Runs all the given arguments as a single command. Maintains quoting. Places
+# output in ${OUTPUT} and exit code in ${EXIT_CODE}. Does not support pipes and
+# redirections. Support for them could be added through eval and single
+# parameter assignment, but eval is not recommended.
+# shellcheck disable=SC2034
+# SC2034: ... appears unused. Verify use (or export if used externally).
+run_command() {
+    if test -n "${DEBUG+x}"; then
+        printf '%s\n' "${*}" >&2
+    fi
+    set +e
+    OUTPUT=$("${@}")
+    EXIT_CODE=${?}
+    set -e
+}
+
+# Enable traps to print FAILED status when a command fails unexpectedly or when
+# the user sends a SIGINT. Used in `test_start`.
+traps_on() {
+    for t in HUP INT QUIT KILL TERM EXIT; do
+        # shellcheck disable=SC2064
+        # SC2064: Use single quotes, otherwise this expands now rather than when signalled.
+        # reason: we want ${red-} and ${reset-} to expand here, at trap-time
+        # they will be empty or have other values
+        trap "
+            exit_code=\${?}
+            printf '${red-}[  FAILED  ]${reset-} %s (exit code: %d)\n' \
+                \"\${TEST_NAME}\" \"\${exit_code}\"
+        " "${t}"
+    done
+}
+
+# Disable traps so that a double status is not printed. Used in `test_finish`
+# after the status has been printed explicitly.
+traps_off() {
+    for t in HUP INT QUIT KILL TERM EXIT; do
+        trap - "${t}"
+    done
+}
+
+# Print UNIX time with millisecond resolution.
+get_current_time() {
+    local time
+    time=$(date +%s%3N)
+
+    # In some systems, particularly BSD-based, `+%3N` millisecond resolution is
+    # not supported. It instead prints the literal '3N', but we check for any
+    # alphabetical character. If we do find one, revert to second resolution and
+    # convert to milliseconds.
+    if printf '%s' "${time}" | grep -E '[A-Za-z]' > /dev/null 2>&1; then
+        time=$(date +%s)
+        time=$((1000 * time))
+    fi
+
+    printf '%s' "${time}"
+}
+
+# Begins a test by printing its name.
+test_start() {
+    TEST_NAME=${1-}
+    if [ -z "${TEST_NAME}" ]; then
+        test_lib_error "test_start requires test name as an argument"
+        clean_exit 1
+    fi
+
+    # Set traps first to fail if something goes wrong.
+    traps_on
+
+    # Announce test start.
+    printf "${green-}[ RUN      ]${reset-} %s\n" "${TEST_NAME}"
+
+    # Remove dangling Kea instances and remove log files.
+    cleanup
+
+    # Make sure lockfile and pidfile directories exist. They are used in some
+    # tests.
+    mkdir -p "${KEA_LOCKFILE_DIR}"
+    # There are certain tests that intentionally run without a KEA_PIDFILE_DIR
+    # e.g. keactrl.status_test. Only create the directory if we test requires
+    # one.
+    if test -n "${KEA_PIDFILE_DIR+x}"; then
+      mkdir -p "${KEA_PIDFILE_DIR}"
+    fi
+
+    # Start timer in milliseconds.
+    START_TIME=$(get_current_time)
+}
+
+# Prints test result an cleans up after the test.
+test_finish() {
+    # Exit code to be returned by the exit function
+    local exit_code="${1}"
+
+    # Stop timer and set duration.
+    FINISH_TIME=$(get_current_time)
+    local duration
+    duration=$((FINISH_TIME - START_TIME))
+
+    # Add the test result to the XML.
+    report_test_result_in_xml "${TEST_NAME}" "${exit_code}" "${duration}"
+
+    if [ "${exit_code}" -eq 0 ]; then
+        printf "${green-}[       OK ]${reset-} %s\n" "${TEST_NAME}"
+    else
+        # Dump log file for debugging purposes if specified and exists.
+        # Otherwise the code below would simply call cat.
+        # Use ${var+x} to test if ${var} is defined.
+        if test -n "${LOG_FILE+x}" && test -s "${LOG_FILE}"; then
+            printf 'Log file dump:\n'
+            cat "${LOG_FILE}"
+        fi
+        printf "${red-}[  FAILED  ]${reset-} %s\n" "${TEST_NAME}"
+    fi
+
+    # Remove dangling Kea instances and log files.
+    cleanup
+
+    # Reset traps.
+    traps_off
+
+    # Explicitly return ${exit_code}. The effect should be for `make check` to
+    # return with the exit same code or at least another non-zero exit code thus
+    # reporting a failure.
+    return "${exit_code}"
+}
+
+# Stores the configuration specified as a parameter in the configuration
+# file which name has been set in the ${CFG_FILE} variable.
+create_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${CFG_FILE+x}" ]; then
+        test_lib_error "create_config requires CFG_FILE variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_config requires argument holding a configuration"
+        clean_exit 1
+    fi
+    printf 'Creating Kea configuration file: %s.\n' "${CFG_FILE}"
+    printf '%b' "${cfg}" > "${CFG_FILE}"
+}
+
+# Stores the DHCP4 configuration specified as a parameter in the
+# configuration file which name has been set in the ${DHCP4_CFG_FILE}
+# variable.
+create_dhcp4_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${DHCP4_CFG_FILE+x}" ]; then
+        test_lib_error "create_dhcp4_config requires DHCP4_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_dhcp4_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating Dhcp4 configuration file: %s.\n' "${DHCP4_CFG_FILE}"
+    printf '%b' "${cfg}" > "${DHCP4_CFG_FILE}"
+}
+
+# Stores the DHCP6 configuration specified as a parameter in the
+# configuration file which name has been set in the ${DHCP6_CFG_FILE}
+# variable.
+create_dhcp6_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${DHCP6_CFG_FILE+x}" ]; then
+        test_lib_error "create_dhcp6_config requires DHCP6_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_dhcp6_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating Dhcp6 configuration file: %s.\n' "${DHCP6_CFG_FILE}"
+    printf '%b' "${cfg}" > "${DHCP6_CFG_FILE}"
+}
+
+# Stores the D2 configuration specified as a parameter in the
+# configuration file which name has been set in the ${D2_CFG_FILE}
+# variable.
+create_d2_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${D2_CFG_FILE+x}" ]; then
+        test_lib_error "create_d2_config requires D2_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_d2_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating D2 configuration file: %s.\n' "${D2_CFG_FILE}"
+    printf '%b' "${cfg}" > "${D2_CFG_FILE}"
+}
+
+# Stores the CA configuration specified as a parameter in the
+# configuration file which name has been set in the ${CA_CFG_FILE}
+# variable.
+create_ca_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${CA_CFG_FILE+x}" ]; then
+        test_lib_error "create_ca_config requires CA_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_ca_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating Ca configuration file: %s.\n' "${CA_CFG_FILE}"
+    printf '%b' "${cfg}" > "${CA_CFG_FILE}"
+}
+
+# Stores the NC configuration specified as a parameter in the
+# configuration file which name has been set in the ${NC_CFG_FILE}
+# variable.
+create_nc_config() {
+    local cfg="${1-}"  # Configuration string.
+    if [ -z "${NC_CFG_FILE+x}" ]; then
+        test_lib_error "create_nc_config requires NC_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_nc_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating Nc configuration file: %s.\n' "${NC_CFG_FILE}"
+    printf '%b' "${cfg}" > "${NC_CFG_FILE}"
+}
+
+# Stores the keactrl configuration specified as a parameter in the
+# configuration file which name has been set in the ${KEACTRL_CFG_FILE}
+# variable.
+create_keactrl_config() {
+    local cfg="${1-}" # Configuration string.
+    if [ -z "${KEACTRL_CFG_FILE+x}" ]; then
+        test_lib_error "create_keactrl_config requires KEACTRL_CFG_FILE \
+variable be set"
+        clean_exit 1
+
+    elif [ -z "${cfg}" ]; then
+        test_lib_error "create_keactrl_config requires argument holding a \
+configuration"
+        clean_exit 1
+    fi
+    printf 'Creating keactrl configuration file: %s.\n' "${KEACTRL_CFG_FILE}"
+    printf '%b' "${cfg}" > "${KEACTRL_CFG_FILE}"
+}
+
+# Sets Kea logger to write to the file specified by the global value
+# ${LOG_FILE}.
+set_logger() {
+    if [ -z "${LOG_FILE+x}" ]; then
+        test_lib_error "set_logger requires LOG_FILE variable be set"
+        clean_exit 1
+    fi
+    printf 'Kea log will be stored in %s.\n' "${LOG_FILE}"
+    export KEA_LOGGER_DESTINATION=${LOG_FILE}
+}
+
+# Checks if specified process is running.
+#
+# This function uses PID file to obtain the PID and then calls
+# 'kill -0 <pid>' to check if the process is alive.
+# The PID files are expected to be located in the ${KEA_PIDFILE_DIR},
+# and their names should match the following pattern:
+# <cfg_file_name>.<proc_name>.pid. If the <cfg_file_name> is not
+# specified a 'test_config' is used by default.
+#
+# Return value:
+#   _GET_PID: holds a PID if process is running
+#   _GET_PIDS_NUM: holds 1 if process is running, 0 otherwise
+get_pid() {
+    local proc_name="${1-}"         # Process name
+    local cfg_file_name="${2-}"     # Configuration file name without extension.
+
+    # Reset PID results.
+    _GET_PID=0
+    _GET_PIDS_NUM=0
+
+    # PID file name includes process name. The process name is required.
+    if [ -z "${proc_name}" ]; then
+        test_lib_error "get_pid requires process name"
+        clean_exit 1
+    fi
+
+    # There are certain tests that intentionally run without a KEA_PIDFILE_DIR
+    # e.g. keactrl.status_test. We can't get the PID if KEA_PIDFILE_DIR is not
+    # defined. In this case, this function is reporting process not running
+    # (_GET_PID == 0).
+    if test -z "${KEA_PIDFILE_DIR+x}"; then
+      return
+    fi
+
+    # PID file name includes server configuration file name. For most of
+    # the tests it is 'test-config' (excluding .json extension). It is
+    # possible to specify custom name if required.
+    if [ -z "${cfg_file_name}" ]; then
+        cfg_file_name="test_config"
+    fi
+
+    # Get the absolute location of the PID file for the specified process
+    # name.
+    abs_pidfile_path="${KEA_PIDFILE_DIR}/${cfg_file_name}.${proc_name}.pid"
+
+    # If the PID file exists, get the PID and see if the process is alive.
+    pid=$(cat "${abs_pidfile_path}" 2> /dev/null || true)
+    if test -n "${pid}"; then
+        if kill -0 "${pid}" > /dev/null 2>&1; then
+            _GET_PID=${pid}
+            _GET_PIDS_NUM=1
+        fi
+    fi
+}
+
+# Get the name of the process identified by PID.
+get_process_name() {
+    local pid="${1-}"
+    if test -z "${pid}"; then
+        test_lib_error 'expected PID parameter in get_process_name'
+        clean_exit 1
+    fi
+
+    ps "${pid}" | tr -s ' ' | cut -d ' ' -f 6- | head -n 2 | tail -n 1
+}
+
+# Wait for file to be created.
+wait_for_file() {
+    local file="${1-}"
+    if test -z "${file}"; then
+        test_lib_error 'expected file parameter in wait_for_file'
+        clean_exit 1
+    fi
+
+    local timeout='4' # seconds
+    local deadline="$(($(date +%s) + timeout))"
+    while ! test -f "${file}"; do
+        if test "${deadline}" -lt "$(date +%s)"; then
+            # Time is up.
+            printf 'ERROR: file "%s" was not created in time.\n' "${file}" >&2
+            return 1
+        fi
+        printf 'Waiting for file "%s" to be created...\n' "${file}"
+        sleep 1
+    done
+}
+
+# Wait for process identified by PID to die.
+wait_for_process_to_stop() {
+    local pid="${1-}"
+    if test -z "${pid}"; then
+        test_lib_error 'expected PID parameter in wait_for_process_to_stop'
+        clean_exit 1
+    fi
+
+    local timeout='4' # seconds
+    local deadline="$(($(date +%s) + timeout))"
+    while ps "${pid}" >/dev/null; do
+        if test "${deadline}" -lt "$(date +%s)"; then
+            # Time is up.
+            printf 'ERROR: %s is not stopping.\n' "$(get_process_name "${pid}")" >&2
+            return 1
+        fi
+        printf 'Waiting for %s to stop...\n' "$(get_process_name "${pid}")"
+        sleep 1
+    done
+}
+
+# Kills processes specified by name.
+#
+# This function kills all processes having a specified name.
+# It uses 'pgrep' to obtain pids of those processes.
+# This function should be used when identifying process by
+# the value in its PID file is not relevant.
+#
+# Linux limitation for pgrep: The process name used for matching is
+# limited to the 15 characters. If you call this with long process
+# names, add this before pgrep:
+# proc_name=$(printf '%s' "${proc_name}" | cut -c1-15)
+kill_processes_by_name() {
+    local proc_name="${1-}"     # Process name
+    if [ -z "${proc_name}" ]; then
+        test_lib_error "kill_processes_by_name requires process name"
+        clean_exit 1
+    fi
+
+    # Obtain PIDs of running processes.
+    local pids
+    pids=$(pgrep "${proc_name}" || true)
+    # For each PID found, send kill signal.
+    for pid in ${pids}; do
+        printf 'Shutting down Kea process %s with PID %d...\n' "${proc_name}" "${pid}"
+        kill -9 "${pid}" || true
+    done
+
+    # Wait for all processes to stop.
+    for pid in ${pids}; do
+        printf 'Waiting for Kea process %s with PID %d to stop...\n' "${proc_name}" "${pid}"
+        wait_for_process_to_stop "${pid}"
+    done
+}
+
+# Returns the number of occurrences of the Kea log message in the log file.
+# Return value:
+#   _GET_LOG_MESSAGES: number of log message occurrences.
+get_log_messages() {
+    local msg="${1}"  # Message id, e.g. DHCP6_SHUTDOWN
+    if [ -z "${msg}" ]; then
+        test_lib_error "get_log_messages require message identifier"
+        clean_exit 1
+    fi
+    _GET_LOG_MESSAGES=0
+    # If log file is not present, the number of occurrences is 0.
+    # Use ${var+x} to test if ${var} is defined.
+    if test -n "${LOG_FILE+x}" && test -s "${LOG_FILE}"; then
+        # Grep log file for the logger message occurrences and remove
+        # whitespaces, if any.
+        _GET_LOG_MESSAGES=$(grep -Fo "${msg}" "${LOG_FILE}" | wc -w | tr -d " ")
+    fi
+}
+
+# Returns the number of server configurations performed so far. Also
+# returns the number of configuration errors.
+# Return values:
+#   _GET_RECONFIGS: number of configurations so far.
+#   _GET_RECONFIG_ERRORS: number of configuration errors.
+get_reconfigs() {
+    # Grep log file for CONFIG_COMPLETE occurrences. There should
+    # be one occurrence per (re)configuration.
+    _GET_RECONFIGS=$(grep -Fo CONFIG_COMPLETE "${LOG_FILE}" | wc -w)
+    # Grep log file for CONFIG_LOAD_FAIL to check for configuration
+    # failures.
+    _GET_RECONFIG_ERRORS=$(grep -Fo CONFIG_LOAD_FAIL "${LOG_FILE}" | wc -w)
+    # Remove whitespaces
+    ${_GET_RECONFIGS##*[! ]}
+    ${_GET_RECONFIG_ERRORS##*[! ]}
+}
+
+# Remove the given directories or files if they exist.
+remove_if_exists() {
+    while test ${#} -gt 0; do
+        if test -e "${1}"; then
+            rm -rf "${1}"
+        fi
+        shift
+    done
+}
+
+# Performs cleanup after test.
+# It shuts down running Kea processes and removes temporary files.
+# The location of the log file and the configuration files should be set
+# in the ${LOG_FILE}, ${CFG_FILE} and ${KEACTRL_CFG_FILE} variables
+# respectively, prior to calling this function.
+cleanup() {
+    # If there is no KEA_PROCS set, just return
+    if [ -z "${KEA_PROCS}" ]; then
+        return
+    fi
+
+    # KEA_PROCS holds the name of all Kea processes. Shut down each
+    # of them if running.
+    for proc_name in ${KEA_PROCS}
+    do
+        get_pid "${proc_name}"
+        # Shut down running Kea process.
+        if [ "${_GET_PIDS_NUM}" -ne 0 ]; then
+            printf 'Shutting down Kea process having pid %d.\n' "${_GET_PID}"
+            kill -9 "${_GET_PID}"
+        fi
+    done
+
+    # Kill any running LFC processes. Even though 'kea-lfc' creates PID
+    # file we rather want to use 'pgrep' to find the process PID, because
+    # kea-lfc execution is not controlled from the test and thus there
+    # is possibility that process is already/still running but the PID
+    # file doesn't exist for it. As a result, the process will not
+    # be killed. This is not a problem for other processes because
+    # tests control launching them and monitor when they are shut down.
+    kill_processes_by_name "kea-lfc"
+
+    # Remove temporary files.
+    remove_if_exists \
+        "${CA_CFG_FILE-}" \
+        "${CFG_FILE-}" \
+        "${D2_CFG_FILE-}" \
+        "${DHCP4_CFG_FILE-}" \
+        "${KEA_DHCP4_LOAD_MARKER_FILE-}" \
+        "${KEA_DHCP4_UNLOAD_MARKER_FILE-}" \
+        "${KEA_DHCP4_SRV_CONFIG_MARKER_FILE-}" \
+        "${DHCP6_CFG_FILE-}" \
+        "${KEA_DHCP6_LOAD_MARKER_FILE-}" \
+        "${KEA_DHCP6_UNLOAD_MARKER_FILE-}" \
+        "${KEA_DHCP6_SRV_CONFIG_MARKER_FILE-}" \
+        "${KEACTRL_CFG_FILE-}" \
+        "${KEA_LOCKFILE_DIR-}" \
+        "${KEA_PIDFILE_DIR-}" \
+        "${NC_CFG_FILE-}"
+
+    # Use ${var+x} to test if ${var} is defined.
+    if test -n "${LOG_FILE+x}" && test -n "${LOG_FILE}"; then
+        rm -rf "${LOG_FILE}"
+        rm -rf "${LOG_FILE}.lock"
+    fi
+    # Use asterisk to remove all files starting with the given name,
+    # in case the LFC has been run. LFC creates files with postfixes
+    # appended to the lease file name.
+    if test -n "${LEASE_FILE+x}" && test -n "${LEASE_FILE}"; then
+        rm -rf "${LEASE_FILE}"*
+    fi
+}
+
+# Exists the test in the clean way.
+# It performs the cleanup and prints whether the test has passed or failed.
+# If a test fails, the Kea log is dumped.
+clean_exit() {
+    exit_code=${1-}  # Exit code to be returned by the exit function.
+    case ${exit_code} in
+        ''|*[!0-9]*)
+            test_lib_error "argument passed to clean_exit must be a number" ;;
+    esac
+    # Print test result and perform a cleanup
+    test_finish "${exit_code}"
+    exit "${exit_code}"
+}
+
+# Starts Kea process in background using a configuration file specified
+# in the global variable ${CFG_FILE}.
+start_kea() {
+    local bin="${1-}"
+    if [ -z "${bin}" ]; then
+        test_lib_error "binary name must be specified for start_kea"
+        clean_exit 1
+    fi
+    printf "Running command %s.\n" "\"${bin} -c ${CFG_FILE}\""
+    "${bin}" -c "${CFG_FILE}" &
+}
+
+# Waits with timeout for Kea to start.
+# This function repeatedly checks if the Kea log file has been created
+# and is non-empty. If it is, the function assumes that Kea has started.
+# It doesn't check the contents of the log file though.
+# If the log file doesn't exist the function sleeps for a second and
+# checks again. This is repeated until timeout is reached or non-empty
+# log file is found. If timeout is reached, the function reports an
+# error.
+# Return value:
+#    _WAIT_FOR_KEA: 0 if Kea hasn't started, 1 otherwise
+wait_for_kea() {
+    local timeout="${1-}"   # Desired timeout in seconds.
+    if test -z "${timeout}"; then
+        test_lib_error 'expected timeout parameter in wait_for_kea'
+        clean_exit 1
+    fi
+    case ${timeout} in
+        ''|*[!0-9]*)
+            test_lib_error "argument passed to wait_for_kea must be a number"
+            clean_exit 1 ;;
+    esac
+    local loops=0 # Loops counter
+    _WAIT_FOR_KEA=0
+    test_lib_info "wait_for_kea " "skip-new-line"
+    while [ ! -s "${LOG_FILE}" ] && [ "${loops}" -le "${timeout}" ]; do
+        printf "."
+        sleep 1
+        loops=$(( loops + 1 ))
+    done
+    printf '\n'
+    if [ "${loops}" -le "${timeout}" ]; then
+        _WAIT_FOR_KEA=1
+    fi
+}
+
+# Waits for a specific message to occur in the Kea log file.
+# This function is called when the test expects specific message
+# to show up in the log file as a result of some action that has
+# been taken. Typically, the test expects that the message
+# is logged when the SIGHUP or SIGTERM signal has been sent to the
+# Kea process.
+# This function waits a specified number of seconds for the number
+# of message occurrences to show up. If the expected number of
+# message doesn't occur, the error status is returned.
+# Return value:
+#    _WAIT_FOR_MESSAGE: 0 if the message hasn't occurred, 1 otherwise.
+wait_for_message() {
+    local timeout="${1-}"      # Expected timeout value in seconds.
+    local message="${2-}"      # Expected message id.
+    local occurrences="${3-}"  # Number of expected occurrences.
+
+    # Validate timeout
+    case ${timeout} in
+        ''|*[!0-9]*)
+            test_lib_error "argument timeout passed to wait_for_message must \
+be a number"
+        clean_exit 1 ;;
+    esac
+
+    # Validate message
+    if [ -z "${message}" ]; then
+        test_lib_error "message id is a required argument for wait_for_message"
+        clean_exit 1
+    fi
+
+    # Validate occurrences
+    case ${occurrences} in
+        ''|*[!0-9]*)
+            test_lib_error "argument occurrences passed to wait_for_message \
+must be a number"
+        clean_exit 1 ;;
+    esac
+
+    local loops=0          # Number of loops performed so far.
+    _WAIT_FOR_MESSAGE=0
+    test_lib_info "wait_for_message ${message}: " "skip-new-line"
+    # Check if log file exists and if we reached timeout.
+    while [ "${loops}" -le "${timeout}" ]; do
+        printf "."
+        # Check if the message has been logged.
+        get_log_messages "${message}"
+        if [ "${_GET_LOG_MESSAGES}" -ge "${occurrences}" ]; then
+            printf '\n'
+            _WAIT_FOR_MESSAGE=1
+            return
+        fi
+        # Message not recorded. Keep going.
+        sleep 1
+        loops=$(( loops + 1 ))
+    done
+    printf '\n'
+    # Timeout.
+}
+
+# Waits for server to be down.
+# Return value:
+#    _WAIT_FOR_SERVER_DOWN: 1 if server is down, 0 if timeout occurred and the
+#                             server is still running.
+wait_for_server_down() {
+    local timeout="${1-}"    # Timeout specified in seconds.
+    local proc_name="${2-}"  # Server process name.
+    if test -z "${proc_name}"; then
+        test_lib_error 'expected process name parameter in wait_for_server_down'
+        clean_exit 1
+    fi
+
+    case ${timeout} in
+        ''|*[!0-9]*)
+            test_lib_error "argument passed to wait_for_server_down must be a number"
+            clean_exit 1 ;;
+    esac
+    local loops=0 # Loops counter
+    _WAIT_FOR_SERVER_DOWN=0
+    test_lib_info "wait_for_server_down ${proc_name}: " "skip-new-line"
+    while [ "${loops}" -le "${timeout}" ]; do
+        printf "."
+        get_pid "${proc_name}"
+        if [ "${_GET_PIDS_NUM}" -eq 0 ]; then
+            printf '\n'
+            _WAIT_FOR_SERVER_DOWN=1
+            return
+        fi
+        sleep 1
+        loops=$(( loops + 1 ))
+    done
+    printf '\n'
+}
+
+# Sends specified signal to the Kea process.
+send_signal() {
+    local sig="${1-}"           # Signal number.
+    local proc_name="${2-}"     # Process name
+
+    # Validate signal
+    case ${sig} in
+        ''|*[!0-9]*)
+            test_lib_error "signal number passed to send_signal \
+must be a number"
+        clean_exit 1 ;;
+    esac
+    # Validate process name
+    if [ -z "${proc_name}" ]; then
+        test_lib_error "send_signal requires process name be passed as argument"
+        clean_exit 1
+    fi
+    # Get Kea pid.
+    get_pid "${proc_name}"
+    if [ "${_GET_PIDS_NUM}" -ne 1 ]; then
+        printf "ERROR: expected one Kea process to be started.\
+ Found %d processes started.\n" ${_GET_PIDS_NUM}
+        clean_exit 1
+    fi
+    printf "Sending signal %s to Kea process (pid=%s).\n" "${sig}" "${_GET_PID}"
+    # Actually send a signal.
+    kill "-${sig}" "${_GET_PID}"
+}
+
+# Verifies that a server is up running by its PID file
+# The PID file is constructed from the given config file name and
+# binary name.  If it exists and the PID it contains refers to a
+# live process it sets _SERVER_PID_FILE and _SERVER_PID to the
+# corresponding values.  Otherwise, it emits an error and exits.
+verify_server_pid() {
+    local bin_name="${1-}" # binary name of the server
+    local cfg_file="${2-}" # config file name
+
+    # We will construct the PID file name based on the server config
+    # and binary name
+    if [ -z "${bin_name}" ]; then
+        test_lib_error "verify_server_pid requires binary name"
+        clean_exit 1
+    fi
+
+    if [ -z "${cfg_file}" ]; then
+        test_lib_error "verify_server_pid requires config file name"
+        clean_exit 1
+    fi
+
+    # Only the file name portion of the config file is used, try and
+    # extract it. NOTE if this "algorithm" changes this code will need
+    # to be updated.
+    fname=$(basename "${cfg_file}")
+    fname=$(echo "${fname}" | cut -f1 -d'.')
+
+    if [ -z "${fname}" ]; then
+        test_lib_error "verify_server_pid could not extract config name"
+        clean_exit 1
+    fi
+
+    # Now we can build the name:
+    pid_file="${KEA_PIDFILE_DIR}/${fname}.${bin_name}.pid"
+
+    if [ ! -e "${pid_file}" ]; then
+        printf "ERROR: PID file:[%s] does not exist\n" "${pid_file}"
+        clean_exit 1
+    fi
+
+    # File exists, does its PID point to a live process?
+    pid=$(cat "${pid_file}" 2> /dev/null || true)
+    if ! kill -0 "${pid}"; then
+        printf "ERROR: PID file:[%s] exists but PID:[%d] does not\n" \
+               "${pid_file}" "${pid}"
+        clean_exit 1
+    fi
+
+    # Make the values accessible to the caller
+    _SERVER_PID="${pid}"
+    _SERVER_PID_FILE="${pid_file}"
+}
+
+# This test verifies that the binary is reporting its version properly.
+version_test() {
+    test_name=${1}      # Test name
+    long_version=${2-}  # Test long version?
+
+    # Log the start of the test and print test name.
+    test_start "${test_name}"
+
+    # If set to anything other than empty string, reset it to the long version
+    # parameter.
+    if test -n "${long_version}"; then
+        long_version='--version'
+    fi
+
+    # Keep ${long_version} unquoted so that it is not included as an empty
+    # string if not given as argument.
+    for v in -v ${long_version}; do
+        run_command \
+            "${bin_path}/${bin}" "${v}"
+
+        if test "${OUTPUT}" != "${EXPECTED_VERSION}"; then
+            printf 'ERROR: Expected version "%s", got "%s" when calling "%s"\n' \
+                "${EXPECTED_VERSION}" "${OUTPUT}" "${bin} ${v}"
+            test_finish 1
+        fi
+    done
+
+    test_finish 0
+}
+
+# This test verifies that the server is using logger variable
+# KEA_LOCKFILE_DIR properly (it should be used to point out to the directory,
+# where lockfile should be created. Also, "none" value means to not create
+# the lockfile at all).
+logger_vars_test() {
+    test_name=${1}  # Test name
+
+    # Log the start of the test and print test name.
+    test_start "${test_name}"
+
+    # Create bogus configuration file. We don't really want the server to start,
+    # just want it to log something and die. Empty config is an easy way to
+    # enforce that behavior.
+    create_config "{ }"
+    printf "Please ignore any config error messages.\n"
+
+    # Remember old KEA_LOCKFILE_DIR
+    KEA_LOCKFILE_DIR_OLD=${KEA_LOCKFILE_DIR}
+
+    # Set lockfile directory to current directory.
+    KEA_LOCKFILE_DIR=.
+
+    # Start Kea.
+    start_kea "${bin_path}/${bin}"
+
+    # Wait for Kea to process the invalid configuration and die.
+    sleep 1
+
+    # Check if it is still running. It should have terminated.
+    get_pid "${bin}"
+    if [ "${_GET_PIDS_NUM}" -ne 0 ]; then
+        printf 'ERROR: expected Kea process to not start. '
+        printf 'Found %d processes running.\n' "${_GET_PIDS_NUM}"
+
+        # Revert to the old KEA_LOCKFILE_DIR value
+        KEA_LOCKFILE_DIR=${KEA_LOCKFILE_DIR_OLD}
+        clean_exit 1
+    fi
+
+    if [ ! -f "./logger_lockfile" ]; then
+        printf 'ERROR: Expect %s to create logger_lockfile in the ' "${bin}"
+        printf 'current directory, but no such file exists.\n'
+
+        # Revert to the old KEA_LOCKFILE_DIR value
+        KEA_LOCKFILE_DIR=${KEA_LOCKFILE_DIR__OLD}
+        clean_exit 1
+    fi
+
+    # Remove the lock file
+    rm -f ./logger_lockfile
+
+    # Tell Kea to NOT create logfiles at all
+    KEA_LOCKFILE_DIR="none"
+
+    # Start Kea.
+    start_kea "${bin_path}/${bin}"
+
+    # Wait for Kea to process the invalid configuration and die.
+    sleep 1
+
+    # Check if it is still running. It should have terminated.
+    get_pid "${bin}"
+    if [ "${_GET_PIDS_NUM}" -ne 0 ]; then
+        printf 'ERROR: expected Kea process to not start. '
+        printf 'Found %d processes running.\n' "${_GET_PIDS_NUM}"
+
+        # Revert to the old KEA_LOCKFILE_DIR value
+        KEA_LOCKFILE_DIR=${KEA_LOCKFILE_DIR_OLD}
+
+        clean_exit 1
+    fi
+
+    if [ -f "./logger_lockfile" ]; then
+        printf 'ERROR: Expect %s to NOT create logger_lockfile in the ' "${bin}"
+        printf 'current directory, but the file exists.\n'
+
+        # Revert to the old KEA_LOCKFILE_DIR value
+        KEA_LOCKFILE_DIR=${KEA_LOCKFILE_DIR_OLD}
+
+        clean_exit 1
+    fi
+
+    # Revert to the old KEA_LOCKFILE_DIR value
+    printf 'Reverting KEA_LOCKFILE_DIR to %s\n' "${KEA_LOCKFILE_DIR_OLD}"
+    KEA_LOCKFILE_DIR=${KEA_LOCKFILE_DIR_OLD}
+
+    test_finish 0
+}
+
+# This test verifies server PID file management
+# 1. It verifies that upon startup, the server creates a PID file
+# 2. It verifies the an attempt to start a second instance fails
+# due to pre-existing PID File/PID detection
+server_pid_file_test() {
+    local server_cfg="${1}"
+    local log_id="${2}"
+
+    # Log the start of the test and print test name.
+    test_start "${bin}.server_pid_file_test"
+    # Create new configuration file.
+    create_config "${CONFIG}"
+    # Instruct server to log to the specific file.
+    set_logger
+    # Start server
+    start_kea "${bin_path}/${bin}"
+    # Wait up to 20s for server to start.
+    wait_for_kea 20
+    if [ "${_WAIT_FOR_KEA}" -eq 0 ]; then
+        printf 'ERROR: timeout waiting for %s to start.\n' "${bin}"
+        clean_exit 1
+    fi
+
+    # Verify server is still running
+    verify_server_pid "${bin}" "${CFG_FILE}"
+
+    printf 'PID file is [%s], PID is [%d]\n' "${_SERVER_PID_FILE}" "${_SERVER_PID}"
+
+    # Now try to start a second one
+    start_kea "${bin_path}/${bin}"
+
+    wait_for_message 10 "${log_id}" 1
+    if [ "${_WAIT_FOR_MESSAGE}" -eq 0 ]; then
+        printf 'ERROR: Second %s instance started? ' "${bin}"
+        printf 'PID conflict not reported.\n'
+        clean_exit 1
+    fi
+
+    # Verify server is still running
+    verify_server_pid "${bin}" "${CFG_FILE}"
+
+    # All ok. Shut down the server and exit.
+    test_finish 0
+}
+
+# This test verifies that passwords are redacted in logs.
+# This function takes 2 parameters:
+# test_name
+# config - string with a content of the config (will be written to a file)
+# expected_code - expected exit code returned by kea (0 - success, 1 - failure)
+password_redact_test() {
+    local test_name="${1}"
+    local config="${2}"
+    local expected_code="${3}"
+
+    # Log the start of the test and print test name.
+    test_start "${test_name}"
+    # Create correct configuration file.
+    create_config "${config}"
+    # Instruct Control Agent to log to the specific file.
+    set_logger
+    # Check it
+    printf "Running command %s.\n" "\"${bin_path}/${bin} -d -t ${CFG_FILE}\""
+    run_command \
+        "${bin_path}/${bin}" -d -t "${CFG_FILE}"
+    if [ "${EXIT_CODE}" -ne "${expected_code}" ]; then
+        printf 'ERROR: expected exit code %s, got %s\n' "${expected_code}" "${EXIT_CODE}"
+        clean_exit 1
+    fi
+    if grep -q 'sensitive' "${LOG_FILE}"; then
+        printf "ERROR: sensitive is present in logs\n"
+        clean_exit 1
+    fi
+    if ! grep -q 'superadmin' "${LOG_FILE}"; then
+        printf "ERROR: superadmin is not present in logs\n"
+        clean_exit 1
+    fi
+    test_finish 0
+}
+
+# kea-dhcp[46] configuration with a password
+# used for redact tests:
+# - sensitive should be hidden
+# - superadmin should be visible
+kea_dhcp_config() {
+    printf '
+{
+  "Dhcp%s": {
+    "config-control": {
+      "config-databases": [
+        {
+          "password": "sensitive",
+          "type": "mysql",
+          "user": "keatest"
+        }
+      ]
+    },
+    "hooks-libraries": [
+      {
+        "library": "@abs_top_builddir@/src/bin/dhcp%s/tests/.libs/libco1.so",
+        "parameters": {
+          "password": "sensitive",
+          "user": "keatest",
+          "nested-map": {
+            "password": "sensitive",
+            "user": "keatest"
+          }
+        }
+      }
+    ],
+    "hosts-database": {
+      "password": "sensitive",
+      "type": "mysql",
+      "user": "keatest"
+    },
+    "lease-database": {
+      "password": "sensitive",
+      "type": "mysql",
+      "user": "keatest"
+    },
+    "user-context": {
+      "password": "superadmin",
+      "secret": "superadmin",
+      "shared-info": {
+        "password": "superadmin",
+        "secret": "superadmin"
+      }
+    }
+  }
+}
+' "${1}" "${1}"
+}
diff --git a/src/lib/testutils/gtest_utils.h b/src/lib/testutils/gtest_utils.h
new file mode 100644
index 0000000..e7b10b2
--- /dev/null
+++ b/src/lib/testutils/gtest_utils.h
@@ -0,0 +1,92 @@
+// Copyright (C) 2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef GTEST_UTILS_H
+#define GTEST_UTILS_H
+
+#include <gtest/gtest.h>
+
+namespace isc {
+namespace test {
+
+/// @brief Verifies an expected exception type and message
+///
+/// If the statement does not generate the expected exception
+/// containing the expected message it will generate a non-fatal
+/// failure.
+///
+/// @param statement - statement block to execute
+/// @param etype - type of exception expected
+/// @param emsg - exact content expected to be returned by ex.what()
+#define EXPECT_THROW_MSG(statement,etype,emsg) \
+{ \
+    try { \
+        statement; \
+        ADD_FAILURE() << "no exception, expected: " << #etype; \
+    } catch (const etype& ex)  { \
+        EXPECT_EQ(std::string(ex.what()), emsg); \
+    } catch (...) { \
+        ADD_FAILURE() << "wrong exception type thrown, expected: " << #etype; \
+    } \
+} \
+
+/// @brief Verifies an expected exception type and message
+///
+/// If the statement does not generate the expected exception
+/// containing the expected message it will generate a fatal
+/// failure.
+///
+/// @param statement - statement block to execute
+/// @param etype - type of exception expected
+/// @param emsg - exact content expected to be returned by ex.what()
+#define ASSERT_THROW_MSG(statement,etype,emsg) \
+{ \
+    try { \
+        statement; \
+        GTEST_FAIL() << "no exception, expected: " << #etype; \
+    } catch (const etype& ex)  { \
+        ASSERT_EQ(std::string(ex.what()), emsg); \
+    } catch (...) { \
+        GTEST_FAIL() << "wrong exception type thrown, expected: " << #etype; \
+    } \
+} \
+
+/// @brief Adds a non-fatal failure with exception info, if the given
+/// expression throws.  Note the type name emitted may be mangled.
+///
+/// @param statement - statement block to execute
+#define EXPECT_NO_THROW_LOG(statement) \
+{ \
+    try { \
+        statement; \
+    } catch (const std::exception& ex)  { \
+        ADD_FAILURE() << #statement <<  " threw type: " << typeid(ex).name() \
+                      << ", what: " << ex.what(); \
+    } catch (...) { \
+        ADD_FAILURE() << #statement <<  "threw non-std::exception"; \
+    } \
+} \
+
+/// @brief Generates a fatal failure with exception info, if the given
+/// expression throws.  Note the type name emitted may be mangled.
+///
+/// @param statement - statement block to execute
+#define ASSERT_NO_THROW_LOG(statement) \
+{ \
+    try { \
+        statement; \
+    } catch (const std::exception& ex)  { \
+        GTEST_FAIL() << #statement <<  " threw type: " << typeid(ex).name() \
+                     << ", what: " << ex.what(); \
+    } catch (...) { \
+        GTEST_FAIL() << #statement <<  " threw non-std::exception"; \
+    } \
+} \
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // GTEST_UTILS_H
diff --git a/src/lib/testutils/io_utils.cc b/src/lib/testutils/io_utils.cc
new file mode 100644
index 0000000..4b08f16
--- /dev/null
+++ b/src/lib/testutils/io_utils.cc
@@ -0,0 +1,117 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <testutils/io_utils.h>
+#include <gtest/gtest.h>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+namespace isc {
+namespace test {
+
+bool fileExists(const std::string& file_path) {
+    struct stat statbuf;
+    return(stat(file_path.c_str(), &statbuf) == 0);
+}
+
+std::string readFile(const std::string& file_path) {
+    std::ifstream ifs;
+    ifs.open(file_path.c_str(), std::ifstream::in);
+    if (!ifs.good()) {
+        return (std::string());
+    }
+    std::string buf;
+    std::ostringstream output;
+    while (!ifs.eof() && ifs.good()) {
+        ifs >> buf;
+        output << buf;
+    }
+    ifs.close();
+
+    return (output.str());
+}
+
+std::string decommentJSONfile(const std::string& input_file) {
+
+    using namespace std;
+
+    ifstream f(input_file);
+    if (!f.is_open()) {
+        isc_throw(isc::BadValue, "can't open input file for reading: " + input_file);
+    }
+
+    string outfile;
+    size_t last_slash = input_file.find_last_of("/");
+    if (last_slash != string::npos) {
+        outfile = input_file.substr(last_slash + 1);
+    } else {
+        outfile = input_file;
+    }
+    outfile += "-decommented";
+
+    ofstream out(outfile);
+    if (!out.is_open()) {
+        isc_throw(isc::BadValue, "can't open output file for writing: " + input_file);
+    }
+
+    bool in_comment = false;
+    string line;
+    while (std::getline(f, line)) {
+        // First, let's get rid of the # comments
+        size_t hash_pos = line.find("#");
+        if (hash_pos != string::npos) {
+            line = line.substr(0, hash_pos);
+        }
+
+        // Second, let's get rid of the // comments
+        // at the beginning or after a control character.
+        size_t dblslash_pos = line.find("//");
+        if ((dblslash_pos != string::npos) &&
+            ((dblslash_pos == 0) ||
+             ((unsigned) line[dblslash_pos - 1] <= 32))) {
+            line = line.substr(0, dblslash_pos);
+        }
+
+        // Now the tricky part: c comments.
+        size_t begin_pos = line.find("/*");
+        size_t end_pos = line.find("*/");
+        if (in_comment && end_pos == string::npos) {
+            // we continue through multiline comment
+            line = "";
+        } else {
+
+            if (begin_pos != string::npos) {
+                in_comment = true;
+                if (end_pos != string::npos) {
+                    // single line comment. Let's get rid of the content in between
+                    line = line.replace(begin_pos, end_pos + 2, end_pos + 2 - begin_pos, ' ');
+                    in_comment = false;
+                } else {
+                    line = line.substr(0, begin_pos);
+                }
+            } else {
+                if (in_comment && end_pos != string::npos) {
+                    line = line.replace(0, end_pos +2 , end_pos + 2, ' ');
+                    in_comment = false;
+                }
+            }
+        }
+
+        // Finally, write the line to the output file.
+        out << line << endl;
+    }
+    f.close();
+    out.close();
+
+    return (outfile);
+}
+
+}; // end of isc::test namespace
+}; // end of isc namespace
diff --git a/src/lib/testutils/io_utils.h b/src/lib/testutils/io_utils.h
new file mode 100644
index 0000000..58fd015
--- /dev/null
+++ b/src/lib/testutils/io_utils.h
@@ -0,0 +1,45 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TEST_IO_UTILS_H
+#define TEST_IO_UTILS_H
+
+#include <string>
+#include <sys/stat.h>
+
+namespace isc {
+namespace test {
+
+/// @brief Checks if specified file exists.
+///
+/// @param file_path Path to a file.
+/// @return true if the file exists, false otherwise.
+bool fileExists(const std::string& file_path);
+
+/// @brief Reads contents of the specified file.
+///
+/// @param file_path Path to a file.
+/// @return File contents.
+std::string readFile(const std::string& file_path);
+
+/// @brief Removes comments from a JSON file
+///
+/// Removes //, # and /* */ comments from the input file and writes its content
+/// to another file. The comments are replaced with spaces, so the original
+/// token locations should remain unaffected. This is rather naive
+/// implementation, but it's probably sufficient for testing. It won't be able
+/// to pick any trickier cases, like # or // appearing in strings, nested C++
+/// comments etc at the exception of // in URLs.
+///
+/// @param input_file file to be stripped of comments
+/// @return filename of a new file that has comments stripped from it
+/// @throw BadValue if the input file cannot be opened
+std::string decommentJSONfile(const std::string& input_file);
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // TEST_IO_UTILS_H
diff --git a/src/lib/testutils/lib_load_test_fixture.h b/src/lib/testutils/lib_load_test_fixture.h
new file mode 100644
index 0000000..182d0ef
--- /dev/null
+++ b/src/lib/testutils/lib_load_test_fixture.h
@@ -0,0 +1,148 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_TESTUTILS_LIB_LOAD_TEST_FIXTURE_H
+#define ISC_TESTUTILS_LIB_LOAD_TEST_FIXTURE_H
+
+#include <cc/data.h>
+#include <dhcpsrv/cfgmgr.h>
+#include <process/daemon.h>
+#include <testutils/gtest_utils.h>
+
+namespace isc {
+namespace test {
+
+/// @brief Test fixture for testing loading and unloading of hook libraries.
+class LibLoadTest : public ::testing::Test {
+public:
+    /// @brief Constructor. Unloads any previously loaded libraries.
+    ///
+    /// @param lib_so_name_ full pathname to the library so file under test
+    LibLoadTest(const std::string lib_so_name = "no-lib-specified")
+        : lib_so_name_(lib_so_name) {
+        unloadLibraries();
+    }
+
+    virtual void SetUp() {
+        valid_params_ = validConfigParams();
+    }
+
+    /// @brief Destructor. Unloads any previously loaded libraries.
+    ~LibLoadTest() {
+        unloadLibraries();
+    }
+
+    /// @brief Adds a library along with its parameters to the list of
+    /// libraries to be loaded.
+    ///
+    /// @param library the path to the library to be loaded
+    /// @param parameters the library's parameters in Element format
+    void addLibrary(const std::string& library,
+                    isc::data::ConstElementPtr parameters) {
+        libraries_.push_back({library, parameters});
+    }
+
+    void clearLibraries() {
+        libraries_.clear();
+    }
+
+    /// @brief Load all libraries.
+    ///
+    /// @return true if all libraries loaded successfully, false if one or more
+    /// libraries failed to load.
+    bool loadLibraries() {
+        bool result(false);
+        EXPECT_NO_THROW(result = isc::hooks::HooksManager::loadLibraries(libraries_));
+        return result;
+    }
+
+    /// @brief Unloads all libraries.
+    ///
+    /// @return true if all libraries unloaded successfully, false if they
+    /// are still in memory.
+    bool unloadLibraries() {
+        bool result(false);
+        EXPECT_NO_THROW(result = isc::hooks::HooksManager::unloadLibraries());
+        return result;
+    }
+
+    /// @brief Verifies that a valid daemon can load and unload a
+    /// library multiple times.
+    ///
+    /// @param daemon_name name of the daemon that should try to load the library
+    /// @param family Protocol family of the loading daemon, either
+    /// AF_INET or AF_INET6. Defaults to AF_INET.
+    /// @param params ElementPtr to set of parameters that are valid for the library.
+    /// Defaults to an empty pointer.
+    ///
+    /// @note: implemented here to avoid dependency with the dhcpsrv library.
+    void validDaemonTest(const std::string& daemon_name,
+                         uint16_t family = AF_INET,
+                         const isc::data::ElementPtr& params = isc::data::ElementPtr()) {
+            // Set family and daemon's proc name.
+        isc::dhcp::CfgMgr::instance().setFamily(family);
+        isc::process::Daemon::setProcName(daemon_name);
+
+        clearLibraries();
+
+        // Adding the library to the list of libraries should work.
+        ASSERT_NO_THROW_LOG(addLibrary(lib_so_name_, params));
+
+        // Should be able to load and unload the library more than once.
+        ASSERT_NO_THROW_LOG(loadLibraries());
+        ASSERT_NO_THROW_LOG(unloadLibraries());
+
+        ASSERT_NO_THROW_LOG(loadLibraries());
+        ASSERT_NO_THROW_LOG(unloadLibraries());
+    }
+
+    /// @brief Verifies that an invalid daemon cannot load the library.
+    ///
+    /// @param libname full path to the library's SO. Typically this
+    /// value is defined in the Makefile (e.g. -DLIBDHCP_BOOTP_SO=...)
+    /// @param daemon_name name of the daemon that should try to load the library
+    /// @param family Protocol family of the loading daemon, either
+    /// AF_INET or AF_INET6. Defaults to AF_INET.
+    /// @param params ElementPtr to set of parameters that are valid
+    /// for the library. Defaults to an empty pointer.
+    ///
+    /// @note: implemented here to avoid dependency with the dhcpsrv library.
+    void invalidDaemonTest(const std::string& daemon_name,
+                           uint16_t family = AF_INET,
+                           const isc::data::ElementPtr& params = isc::data::ElementPtr()) {
+        // Set family and daemon's proc name.
+        isc::dhcp::CfgMgr::instance().setFamily(family);
+        isc::process::Daemon::setProcName(daemon_name);
+
+        clearLibraries();
+
+        // Adding the library to the list of libraries should work.
+        ASSERT_NO_THROW_LOG(addLibrary(lib_so_name_, params));
+
+        // Loading the library should fail.
+        ASSERT_FALSE(loadLibraries()) << "library: " << lib_so_name_
+            << ", should not have loaded for: " << daemon_name;
+    }
+
+    /// @brief Creates a set configuration parameters valid for the library.
+    virtual isc::data::ElementPtr validConfigParams() {
+        return (isc::data::Element::createMap());
+    }
+
+    /// @brief full pathname to the library so file under test;
+    std::string lib_so_name_;
+
+    /// @brief Libraries
+    isc::hooks::HookLibsCollection libraries_;
+
+    /// @brief Contains a set configuration parameters valid for the library.
+    isc::data::ElementPtr valid_params_;
+};
+
+}  // namespace test
+}  // namespace isc
+
+#endif // ISC_TESTUTILS_LIB_LOAD_TEST_FIXTURE_H
diff --git a/src/lib/testutils/log_utils.cc b/src/lib/testutils/log_utils.cc
new file mode 100644
index 0000000..56b6d33
--- /dev/null
+++ b/src/lib/testutils/log_utils.cc
@@ -0,0 +1,131 @@
+// Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/log_utils.h>
+#include <cstdlib>
+#include <iostream>
+
+namespace isc {
+namespace dhcp {
+namespace test {
+
+LogContentTest::LogContentTest()
+    :verbose_(false) {
+    // Get rid of any old files
+    remFile();
+
+    // Set up the logger for use in checking the debug statements.
+    // We send the debug statements to a file which we can
+    // check after the evaluations have completed.  We also
+    // set the log severity and debug levels so that the log
+    // statements are executed.
+    LoggerSpecification spec(getRootLoggerName(),
+                             keaLoggerSeverity(isc::log::DEBUG),
+                             keaLoggerDbglevel(isc::log::MAX_DEBUG_LEVEL));
+    OutputOption option;
+    option.destination = OutputOption::DEST_FILE;
+    option.filename = string(LogContentTest::LOG_FILE);
+    spec.addOutputOption(option);
+    LoggerManager manager;
+    manager.process(spec);
+
+    // Overwrite the verbose_ default is the KEA_LOG_CHECK_VERBOSE
+    // environment variable exists.
+    if (getenv(KEA_LOG_CHECK_VERBOSE)) {
+        verbose_ = true;
+    }
+}
+
+LogContentTest:: ~LogContentTest() {
+    remFile();
+}
+
+bool LogContentTest::checkFile() {
+    ifstream file(LOG_FILE);
+    EXPECT_TRUE(file.is_open());
+    string line, exp_line;
+    int i = 0;
+    bool found = true;
+
+    using namespace std;
+
+    while (getline(file, line) && (i != exp_strings_.size())) {
+        exp_line = exp_strings_[i];
+        if (verbose_) {
+            cout << "Read line  : " << line << endl;
+            cout << "Looking for: " << exp_line << endl;
+        }
+        i++;
+        if (string::npos == line.find(exp_line)) {
+            if (verbose_) {
+                cout << "Verdict    : not found" << endl;
+            }
+            found = false;
+        }
+    }
+
+    file.close();
+
+    if ((i != exp_strings_.size()) || (found == false)) {
+        if (verbose_) {
+            cout << "Final verdict: false" << endl;
+        }
+        return (false);
+    }
+
+    return (true);
+}
+
+size_t LogContentTest::countFile(const string& exp_string) {
+    ifstream file(LOG_FILE);
+    EXPECT_TRUE(file.is_open());
+    string line;
+    size_t cnt = 0;
+
+    using namespace std;
+
+    if (verbose_) {
+        cout << "Looking for:" << exp_string << endl;
+    }
+    while (getline(file, line)) {
+        if (verbose_) {
+            cout << "Read line  :" << line << endl;
+        }
+        if (line.find(exp_string) != string::npos) {
+            ++cnt;
+        }
+    }
+
+    file.close();
+
+    if (verbose_) {
+        cout << "Final count: " << cnt << endl;
+    }
+
+    return (cnt);
+}
+
+void LogContentTest::remFile() {
+    static_cast<void>(remove(LOG_FILE));
+}
+
+void LogContentTest::addString(const string& new_string) {
+    exp_strings_.push_back(new_string);
+}
+
+// Set up the name of the LOG_FILE for use in checking
+// the debug statements.
+// Must not be the same file name used by test shell scripts.
+const char* LogContentTest::LOG_FILE = "logtest.log";
+
+// The environment variable to overwrite the verbose_ default value.
+const char* LogContentTest::KEA_LOG_CHECK_VERBOSE = "KEA_LOG_CHECK_VERBOSE";
+
+} // end of isc::dhcp::test namespace
+} // end of isc::dhcp namespace
+} // end of isc namespace
diff --git a/src/lib/testutils/log_utils.h b/src/lib/testutils/log_utils.h
new file mode 100644
index 0000000..7191e0e
--- /dev/null
+++ b/src/lib/testutils/log_utils.h
@@ -0,0 +1,105 @@
+// Copyright (C) 2016-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TEST_LOG_UTILS_H
+#define TEST_LOG_UTILS_H
+
+#include <string>
+#include <fstream>
+
+//#include <config.h>
+
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_support.h>
+
+//#include <boost/shared_ptr.hpp>
+//#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::log;
+
+namespace isc {
+namespace dhcp {
+namespace test {
+
+/// @brief Test class for testing things that emit log entries
+///
+/// This class provides a convenient method for testing out
+/// things that emit log entries.  The class sets up the logging
+/// to log everything into a file and provides a routine to
+/// check the expected strings vs the actual log entries.
+/// The user needs to call the addString function for each of
+/// the strings they expect in the output in the order they
+/// will be emitted.
+
+class LogContentTest : public ::testing::Test {
+public:
+
+    /// @brief Initializes the logger setup for using
+    /// in checking log statements
+    ///
+    /// @todo add support to adjust the severity and debug level
+    /// to allow for better control over the statements that
+    /// get logged.
+    LogContentTest();
+
+    virtual ~LogContentTest();
+
+    /// @brief check that the requested strings are in the
+    /// test log file in the requested order.
+    ///
+    /// This routine expects that the caller has properly
+    /// set up the vector of expected strings by calling
+    /// addString() with the necessary strings.
+    ///
+    /// @return true if all of the strings match
+    bool checkFile();
+
+    /// @brief check that the requested string is in the
+    /// test log file.
+    ///
+    /// @param exp_string the string to be searched
+    /// @return count of matching lines
+    size_t countFile(const string& exp_string);
+
+    /// @brief remove the test log file
+    void remFile();
+
+    /// @brief Enables or disables verbose mode.
+    ///
+    /// See @ref verbose_ for details.
+    ///
+    /// @param talk_a_lot (true - as the name says, false - shut up)
+    void logCheckVerbose(bool talk_a_lot) {
+        verbose_ = talk_a_lot;
+    }
+
+    /// @brief Add a string to the vector of expected strings
+    ///
+    /// @param new_string the string to add to the end of the vector
+    void addString(const string& new_string);
+
+    vector<string> exp_strings_;
+    static const char* LOG_FILE;
+    static const char* KEA_LOG_CHECK_VERBOSE;
+
+    /// @brief controls whether the checkFile() should print more details.
+    ///
+    /// If set to true, checkFile() will print each expected line, each
+    /// logged line and will print out a failure message if those two do
+    /// not match. Also, a final verdict is printed. Everything is printed
+    /// on stdout.
+    /// The default is false but can be overwritten by setting the
+    /// KEA_LOG_CHECK_VERBOSE environment variable.
+    bool verbose_;
+};
+
+} // end of isc::dhcp::test namespace
+} // end of isc::dhcp namespace
+} // end of isc namespace
+#endif // TEST_LOG_UTILS_H
diff --git a/src/lib/testutils/multi_threading_utils.h b/src/lib/testutils/multi_threading_utils.h
new file mode 100644
index 0000000..8754208
--- /dev/null
+++ b/src/lib/testutils/multi_threading_utils.h
@@ -0,0 +1,38 @@
+// Copyright (C) 2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef MULTI_THREADING_UTILS_H
+#define MULTI_THREADING_UTILS_H
+
+#include <util/multi_threading_mgr.h>
+
+namespace isc {
+namespace test {
+
+/// @brief A RAII class which disables the multi threading on exit of scope.
+///
+/// Usually the multi threading is disabled by the fixture destructor or
+/// TearDown but of course this works only when a fixture class is used.
+class MultiThreadingTest {
+public:
+
+    /// @brief Constructor (set multi threading mode).
+    ///
+    /// @param mode The mode to use in the body. Defaults to true / enabled.
+    MultiThreadingTest(bool mode = true) {
+        isc::util::MultiThreadingMgr::instance().setMode(mode);
+    }
+
+    /// @brief Destructor (disable multi threading).
+    ~MultiThreadingTest() {
+        isc::util::MultiThreadingMgr::instance().setMode(false);
+    }
+};
+
+} // end of isc::test namespace
+} // end of isc namespace
+
+#endif // MULTI_THREADING_UTILS_H
diff --git a/src/lib/testutils/sandbox.h b/src/lib/testutils/sandbox.h
new file mode 100644
index 0000000..8dfb572
--- /dev/null
+++ b/src/lib/testutils/sandbox.h
@@ -0,0 +1,69 @@
+// Copyright (C) 2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef SANDBOX_H
+#define SANDBOX_H
+
+#include <exceptions/exceptions.h>
+
+#include <iostream>
+#include <string>
+#include <cstdlib>
+#include <cstdio>
+#include <unistd.h>
+#include <ftw.h>
+
+namespace isc {
+namespace test {
+
+/// @brief A Sandbox class that provides access to unit test unique
+///    temporary folder.
+///
+/// The sandbox's temporary folder is created in constructor ie.
+/// in unit test setup phase, and then it is deleted with its content
+/// in destructor ie. in unit test tear down phase.
+class Sandbox {
+private:
+    /// Path to temporary folder
+    std::string path_;
+
+    /// @brief Method for deleting files and folders, used in nftw traversal function.
+    ///
+    /// @param fpath path to the file to be removed.
+    static int rmFile(const char *fpath, const struct stat *, int , struct FTW *) {
+        return(remove(fpath));
+    }
+
+public:
+    /// @brief Sandbox constructor.
+    Sandbox() {
+        char tmpl[] = {P_tmpdir "/kea-XXXXXX"};
+        path_ = mkdtemp(tmpl);
+    }
+
+    /// @brief Destructor, it deletes temporary folder with its content.
+    ~Sandbox() {
+        // Delete content of path_ recursively.
+        if (nftw(path_.c_str(), Sandbox::rmFile, 10, FTW_DEPTH | FTW_MOUNT | FTW_PHYS) < 0) {
+            auto msg = "Some error occurred while deleting unit test sandbox " + path_;
+            std::perror(msg.c_str());
+            exit(1);
+        }
+    }
+
+    /// @brief Join sandbox path with indicated file subpath.
+    ///
+    /// @param file path to file that should be joined to base path of sandbox.
+    std::string join(std::string file) {
+        return (path_ + "/" + file);
+    }
+};
+
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // SANDBOX_H
diff --git a/src/lib/testutils/test_to_element.cc b/src/lib/testutils/test_to_element.cc
new file mode 100644
index 0000000..115757a
--- /dev/null
+++ b/src/lib/testutils/test_to_element.cc
@@ -0,0 +1,34 @@
+// Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/test_to_element.h>
+#include <boost/algorithm/string.hpp>
+#include <gtest/gtest.h>
+#include <string>
+#include <vector>
+
+namespace isc {
+namespace test {
+
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+std::string generateDiff(std::string left, std::string right) {
+    std::vector<std::string> left_lines;
+    boost::split(left_lines, left, boost::is_any_of("\n"));
+    std::vector<std::string> right_lines;
+    boost::split(right_lines, right, boost::is_any_of("\n"));
+    using namespace testing::internal;
+    return (edit_distance::CreateUnifiedDiff(left_lines, right_lines));
+}
+#else
+std::string generateDiff(std::string, std::string) {
+    return ("");
+}
+#endif
+
+}; // end of isc::test namespace
+}; // end of isc namespace
diff --git a/src/lib/testutils/test_to_element.h b/src/lib/testutils/test_to_element.h
new file mode 100644
index 0000000..1aa88fc
--- /dev/null
+++ b/src/lib/testutils/test_to_element.h
@@ -0,0 +1,91 @@
+// Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TEST_TO_ELEMENT_H
+#define TEST_TO_ELEMENT_H
+
+#include <cc/data.h>
+#include <cc/cfg_to_element.h>
+#include <gtest/gtest.h>
+#include <string>
+#ifdef HAVE_IS_BASE_OF
+#include <type_traits>
+#endif
+
+#ifndef CONFIG_H_WAS_INCLUDED
+#error config.h must be included before test_to_element.h
+#endif
+
+namespace isc {
+namespace test {
+
+/// @brief Return the difference between two strings
+///
+/// Use the gtest >= 1.8.0 tool which builds the difference between
+/// two vectors of lines.
+///
+/// @param left left string
+/// @param right right string
+/// @return the unified diff between left and right
+std::string generateDiff(std::string left, std::string right);
+
+/// @brief Run a test using toElement() method with a string
+///
+/// @tparam Cfg the class implementing the toElement() method
+/// @param expected the expected textual value
+/// @param cfg an instance of the Cfg class
+template<typename Cfg>
+void runToElementTest(const std::string& expected, const Cfg& cfg) {
+    using namespace isc::data;
+#ifdef HAVE_IS_BASE_OF
+    static_assert(std::is_base_of<CfgToElement, Cfg>::value,
+                  "CfgToElement is not a base of the template parameter");
+#endif
+    ConstElementPtr json;
+    ASSERT_NO_THROW(json = Element::fromJSON(expected)) << expected;
+    ConstElementPtr unparsed;
+    ASSERT_NO_THROW(unparsed = cfg.toElement());
+    if (!isEquivalent(json, unparsed)) {
+        std::string wanted = prettyPrint(json);
+        std::string got = prettyPrint(unparsed);
+        ADD_FAILURE() << "Expected:\n" << wanted << "\n"
+                      << "Actual:\n" << got
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+                      << "\nDiff:\n" << generateDiff(wanted, got)
+#endif
+                      << "\n";
+    }
+}
+
+/// @brief Run a test using toElement() method with an Element
+///
+/// @tparam Cfg the class implementing the toElement() method
+/// @param expected the expected element value
+/// @param cfg an instance of the Cfg class
+template<typename Cfg>
+void runToElementTest(isc::data::ConstElementPtr expected, const Cfg& cfg) {
+#ifdef HAVE_IS_BASE_OF
+    static_assert(std::is_base_of<isc::data::CfgToElement, Cfg>::value,
+                  "CfgToElement is not a base of the template parameter");
+#endif
+    isc::data::ConstElementPtr unparsed;
+    ASSERT_NO_THROW(unparsed = cfg.toElement());
+    if (!isEquivalent(expected, unparsed)) {
+        std::string wanted = prettyPrint(expected);
+        std::string got = prettyPrint(unparsed);
+        ADD_FAILURE() << "Expected:\n" << wanted << "\n"
+                      << "Actual:\n" << got
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+                      << "\nDiff:\n" << generateDiff(wanted, got)
+#endif
+                      << "\n";
+    }
+}
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // TEST_TO_ELEMENT_H
diff --git a/src/lib/testutils/threaded_test.cc b/src/lib/testutils/threaded_test.cc
new file mode 100644
index 0000000..88cb846
--- /dev/null
+++ b/src/lib/testutils/threaded_test.cc
@@ -0,0 +1,73 @@
+// Copyright (C) 2018-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/threaded_test.h>
+
+namespace isc {
+namespace test {
+
+ThreadedTest::ThreadedTest()
+    : thread_(), condvar_(), ready_(false), stopping_(false),
+      stopped_(false) {
+}
+
+void
+ThreadedTest::doSignal(bool& flag) {
+    {
+        std::lock_guard<std::mutex> lock(mutex_);
+        flag = true;
+    }
+    condvar_.notify_one();
+}
+
+void
+ThreadedTest::signalReady() {
+    doSignal(ready_);
+}
+
+void
+ThreadedTest::signalStopping() {
+    doSignal(stopping_);
+}
+
+void
+ThreadedTest::signalStopped() {
+    doSignal(stopped_);
+}
+
+void
+ThreadedTest::doWait(bool& flag) {
+    std::unique_lock<std::mutex> lock(mutex_);
+    while (!flag) {
+        condvar_.wait(lock);
+    }
+}
+
+void
+ThreadedTest::waitReady() {
+    doWait(ready_);
+}
+
+void
+ThreadedTest::waitStopping() {
+    doWait(stopping_);
+}
+
+void
+ThreadedTest::waitStopped() {
+    doWait(stopped_);
+}
+
+bool
+ThreadedTest::isStopping() {
+    std::lock_guard<std::mutex> lock(mutex_);
+    return (stopping_);
+}
+
+} // end of namespace isc::test
+} // end of namespace isc
diff --git a/src/lib/testutils/threaded_test.h b/src/lib/testutils/threaded_test.h
new file mode 100644
index 0000000..6f430e4
--- /dev/null
+++ b/src/lib/testutils/threaded_test.h
@@ -0,0 +1,88 @@
+// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef THREADED_TEST_H
+#define THREADED_TEST_H
+
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <thread>
+#include <mutex>
+#include <condition_variable>
+
+namespace isc {
+namespace test {
+
+/// @brief Base class for tests requiring threads.
+///
+/// This class contains 3 flags to signal when the thread has
+/// started, is stopping and when it is stopped. The flags
+/// are accessed in thread safe manner.
+class ThreadedTest : public ::testing::Test {
+protected:
+
+    /// @brief Constructor.
+    ThreadedTest();
+
+    /// @brief Sets selected flag to true and signals condition
+    /// variable.
+    ///
+    /// @param flag Reference to flag which should be set to true.
+    void doSignal(bool& flag);
+
+    /// @brief Signal that thread is ready.
+    void signalReady();
+
+    /// @brief Signal that thread is stopping.
+    void signalStopping();
+
+    /// @brief Signal that thread is stopped.
+    void signalStopped();
+
+    /// @brief Wait for a selected flag to be set.
+    ///
+    /// @param flag Reference to a flag on which the thread is
+    /// waiting.
+    void doWait(bool& flag);
+
+    /// @brief Wait for the thread to be ready.
+    void waitReady();
+
+    /// @brief Wait for the thread to be stopping.
+    void waitStopping();
+
+    /// @brief Wait for the thread to stop.
+    void waitStopped();
+
+    /// @brief Checks if the thread is stopping.
+    ///
+    /// @return true if the thread is stopping, false otherwise.
+    bool isStopping();
+
+    /// @brief Pointer to server thread.
+    boost::shared_ptr<std::thread> thread_;
+
+    /// @brief Mutex used to synchronize threads.
+    std::mutex mutex_;
+
+    /// Conditional variable for thread waits.
+    std::condition_variable condvar_;
+
+    /// Flag indicating that the thread is ready.
+    bool ready_;
+
+    /// Flag indicating that the thread is stopping.
+    bool stopping_;
+
+    /// Flag indicating that the thread is stopped.
+    bool stopped_;
+};
+
+
+} // end of namespace isc::test
+} // end of namespace isc
+
+#endif
diff --git a/src/lib/testutils/unix_control_client.cc b/src/lib/testutils/unix_control_client.cc
new file mode 100644
index 0000000..f0f8dfa
--- /dev/null
+++ b/src/lib/testutils/unix_control_client.cc
@@ -0,0 +1,139 @@
+// Copyright (C) 2015-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <testutils/unix_control_client.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <errno.h>
+#include <string.h>
+
+namespace isc {
+namespace dhcp {
+namespace test {
+
+UnixControlClient::UnixControlClient() {
+    socket_fd_ = -1;
+}
+
+UnixControlClient::~UnixControlClient() {
+    disconnectFromServer();
+}
+
+    /// @brief Closes the Control Channel socket
+void UnixControlClient::disconnectFromServer() {
+    if (socket_fd_ >= 0) {
+        static_cast<void>(close(socket_fd_));
+        socket_fd_ = -1;
+    }
+}
+
+bool UnixControlClient::connectToServer(const std::string& socket_path) {
+    // Create UNIX socket
+    socket_fd_ = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (socket_fd_ < 0) {
+        const char* errmsg = strerror(errno);
+        ADD_FAILURE() << "Failed to open unix stream socket: " << errmsg;
+        return (false);
+    }
+
+    struct sockaddr_un srv_addr;
+    if (socket_path.size() > sizeof(srv_addr.sun_path) - 1) {
+        ADD_FAILURE() << "Socket path specified (" << socket_path
+                      << ") is larger than " << (sizeof(srv_addr.sun_path) - 1)
+                      << " allowed.";
+        disconnectFromServer();
+        return (false);
+    }
+
+    // Prepare socket address
+    memset(&srv_addr, 0, sizeof(srv_addr));
+    srv_addr.sun_family = AF_UNIX;
+    strncpy(srv_addr.sun_path, socket_path.c_str(),
+            sizeof(srv_addr.sun_path) - 1);
+    socklen_t len = sizeof(srv_addr);
+
+    // Connect to the specified UNIX socket
+    int status = connect(socket_fd_, (struct sockaddr*)&srv_addr, len);
+    if (status == -1) {
+        const char* errmsg = strerror(errno);
+        ADD_FAILURE() << "Failed to connect unix socket: fd=" << socket_fd_
+                      << ", path=" << socket_path << " : " << errmsg;
+        disconnectFromServer();
+        return (false);
+    }
+
+    return (true);
+}
+
+bool UnixControlClient::sendCommand(const std::string& command) {
+    // Send command
+    int bytes_sent = send(socket_fd_, command.c_str(), command.length(), 0);
+    if (bytes_sent < command.length()) {
+        const char* errmsg = strerror(errno);
+        ADD_FAILURE() << "Failed to send " << command.length()
+                      << " bytes, send() returned " << bytes_sent
+                      << " : " << errmsg;
+        return (false);
+    }
+
+    return (true);
+}
+
+bool UnixControlClient::getResponse(std::string& response,
+                                    const unsigned int timeout_sec) {
+    // Receive response
+    char buf[65536];
+    memset(buf, 0, sizeof(buf));
+    switch (selectCheck(timeout_sec)) {
+    case -1: {
+        const char* errmsg = strerror(errno);
+        ADD_FAILURE() << "getResponse - select failed: " << errmsg;
+        return (false);
+    }
+    case 0:
+        return (false);
+
+    default:
+        break;
+    }
+
+    int bytes_rcvd = recv(socket_fd_, buf, sizeof(buf), 0);
+    if (bytes_rcvd < 0) {
+        const char* errmsg = strerror(errno);
+        ADD_FAILURE() << "Failed to receive a response. recv() returned "
+                      << bytes_rcvd << " : " << errmsg;
+        return (false);
+    }
+
+    // Convert the response to a string
+    response = std::string(buf, bytes_rcvd);
+    return (true);
+}
+
+int UnixControlClient::selectCheck(const unsigned int timeout_sec) {
+    int maxfd = 0;
+
+    fd_set read_fds;
+    FD_ZERO(&read_fds);
+
+    // Add this socket to listening set
+    FD_SET(socket_fd_,  &read_fds);
+    maxfd = socket_fd_;
+
+    struct timeval select_timeout;
+    select_timeout.tv_sec = static_cast<time_t>(timeout_sec);
+    select_timeout.tv_usec = 0;
+
+    return (select(maxfd + 1, &read_fds, NULL, NULL, &select_timeout));
+}
+
+};
+};
+};
diff --git a/src/lib/testutils/unix_control_client.h b/src/lib/testutils/unix_control_client.h
new file mode 100644
index 0000000..225c949
--- /dev/null
+++ b/src/lib/testutils/unix_control_client.h
@@ -0,0 +1,66 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef UNIX_CONTROL_CLIENT_H
+#define UNIX_CONTROL_CLIENT_H
+
+#include <string>
+
+namespace isc {
+namespace dhcp {
+namespace test {
+
+/// @brief Class that acts as a UnixCommandSocket client
+///
+/// This class is expected to be used unit-tests that attempt to communicate
+/// with the servers that use control channel (see src/lib/config/command_mgr.h)
+/// It can connect to an open UnixCommandSocket and exchange ControlChannel
+/// commands and responses.
+class UnixControlClient {
+public:
+
+    /// @brief Default constructor
+    UnixControlClient();
+
+    /// @brief Destructor
+    ~UnixControlClient();
+
+    /// @brief Closes the Control Channel socket
+    void disconnectFromServer();
+
+    /// @brief Connects to a Unix socket at the given path
+    /// @param socket_path pathname of the socket to open
+    /// @return true if the connect was successful, false otherwise
+    bool connectToServer(const std::string& socket_path);
+
+    /// @brief Sends the given command across the open Control Channel
+    /// @param command the command text to execute in JSON form
+    /// @return true if the send succeeds, false otherwise
+    bool sendCommand(const std::string& command);
+
+    /// @brief Reads the response text from the open Control Channel
+    /// @param response variable into which the received response should be
+    /// placed.
+    /// @param timeout_sec Timeout for receiving response in seconds.
+    /// @return true if data was successfully read from the socket,
+    /// false otherwise
+    bool getResponse(std::string& response, const unsigned int timeout_sec = 0);
+
+    /// @brief Uses select to poll the Control Channel for data waiting
+    ///
+    /// @param timeout_sec Select timeout in seconds
+    /// @return -1 on error, 0 if no data is available,  1 if data is ready
+    int selectCheck(const unsigned int timeout_sec);
+
+    /// @brief Retains the fd of the open socket
+    int socket_fd_;
+};
+
+}; // end of isc::dhcp::test namespace
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif // UNIX_CONTROL_CLIENT_H
diff --git a/src/lib/testutils/user_context_utils.cc b/src/lib/testutils/user_context_utils.cc
new file mode 100644
index 0000000..bad26bc
--- /dev/null
+++ b/src/lib/testutils/user_context_utils.cc
@@ -0,0 +1,137 @@
+// Copyright (C) 2017-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/user_context_utils.h>
+
+using namespace isc::data;
+
+namespace {
+
+/// @brief Encapsulate either a modified copy or a unmodified value
+/// @tparam EP ElementPtr or ConstElementPtr (compiler can't infer which one)
+template<typename EP>
+class Value {
+public:
+    /// @brief Factory for modified copy
+    static Value mkCopy(EP value) { return (Value(value, false)); }
+
+    /// @brief Factory for unmodified original
+    static Value mkShare(EP value) { return (Value(value, true)); }
+
+    /// @brief Get the value
+    /// @return the value
+    EP get() const { return (value_); }
+
+    /// @brief Get the shared status
+    /// @return true if original, false if copy
+    bool isShared() const { return (shared_); }
+
+private:
+    /// @brief Constructor
+    /// @param value the modified copy or unmodified value
+    /// @param shared true if original, false if copy
+    Value(EP value, bool shared) : value_(value), shared_(shared) { }
+
+    /// @brief the value
+    EP value_;
+
+    /// @brief the shared status
+    bool shared_;
+};
+
+/// @brief Recursive helper
+///
+/// @tparam EP ElementPtr or ConstElementPtr (compiler will infer which one)
+/// @param element the element to traverse
+/// @return a modified copy where comment entries were moved to user-context
+/// or the unmodified original argument encapsulated into a Value
+template<typename EP>
+Value<EP> moveComments1(EP element) {
+    bool modified = false;
+
+    // On lists recurse on items
+    if (element->getType() == Element::list) {
+        ElementPtr result = ElementPtr(new ListElement());
+        typedef std::vector<ElementPtr> ListType;
+        const ListType& list = element->listValue();
+        for (ListType::const_iterator it = list.cbegin();
+             it != list.cend(); ++it) {
+            Value<ElementPtr> item = moveComments1(*it);
+            result->add(item.get());
+            if (!item.isShared()) {
+                modified = true;
+            }
+        }
+        if (!modified) {
+            return (Value<EP>::mkShare(element));
+        } else {
+            return (Value<EP>::mkCopy(result));
+        }
+    } else if (element->getType() != Element::map) {
+        return (Value<EP>::mkShare(element));
+    }
+
+    // Process maps: recurse on items
+    ElementPtr result = ElementPtr(new MapElement());
+    bool has_comment = false;
+    typedef std::map<std::string, ConstElementPtr> map_type;
+    const map_type& map = element->mapValue();
+    for (map_type::const_iterator it = map.cbegin(); it != map.cend(); ++it) {
+        if (it->first == "comment") {
+            // Note there is a comment entry to move
+            has_comment = true;
+        } else if (it->first == "user-context") {
+            // Do not traverse user-context entries
+            result->set("user-context", it->second);
+        } else {
+            // Not comment or user-context
+            Value<ConstElementPtr> item = moveComments1(it->second);
+            result->set(it->first, item.get());
+            if (!item.isShared()) {
+                modified = true;
+            }
+        }
+    }
+    // Check if the value should be not modified
+    if (!has_comment && !modified) {
+        return (Value<EP>::mkShare(element));
+    }
+
+    if (has_comment) {
+        // Move the comment entry
+        ConstElementPtr comment = element->get("comment");
+        ElementPtr moved = Element::createMap();
+        moved->set("comment", comment);
+        ConstElementPtr previous = element->get("user-context");
+        // If there is already a user context merge it
+        if (previous) {
+                merge(moved, previous);
+        }
+        result->set("user-context", moved);
+    }
+
+    return (Value<EP>::mkCopy(result));
+}
+
+} // anonymous namespace
+
+namespace isc {
+namespace test {
+
+ElementPtr moveComments(ElementPtr element) {
+    Value<ElementPtr> result = moveComments1(element);
+    return (result.get());
+}
+
+ConstElementPtr moveComments(ConstElementPtr element) {
+    Value<ConstElementPtr> result = moveComments1(element);
+    return (result.get());
+}
+
+} // end of isc::test namespace
+} // end of isc namespace
diff --git a/src/lib/testutils/user_context_utils.h b/src/lib/testutils/user_context_utils.h
new file mode 100644
index 0000000..3a04f41
--- /dev/null
+++ b/src/lib/testutils/user_context_utils.h
@@ -0,0 +1,37 @@
+// Copyright (C) 2017-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef USER_CONTEXT_UTILS_H
+#define USER_CONTEXT_UTILS_H
+
+#include <cc/data.h>
+
+namespace isc {
+namespace test {
+
+/// @brief Move comment entries to user-context
+///
+/// Process an element looking for comment entries in maps and
+/// moving them to user-context entries. As the common case is
+/// no comment and this routine tries to maximize sharing the
+/// standard behavior is just to return the argument unchanged.
+///
+/// @param element
+/// @return a processed copy of element or unmodified element
+isc::data::ElementPtr moveComments(isc::data::ElementPtr element);
+
+/// @brief Move comment entries to user-context (const variant)
+///
+/// @param element
+/// @return a processed copy of element or unmodified element
+isc::data::ConstElementPtr moveComments(isc::data::ConstElementPtr element);
+
+/// extractComments was removed.
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // USER_CONTEXT_UTILS_H
diff --git a/src/lib/testutils/xml_reporting_test_lib.sh.in b/src/lib/testutils/xml_reporting_test_lib.sh.in
new file mode 100644
index 0000000..7c6dc0f
--- /dev/null
+++ b/src/lib/testutils/xml_reporting_test_lib.sh.in
@@ -0,0 +1,353 @@
+#!/bin/sh
+
+# Copyright (C) 2020-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# shellcheck disable=SC2039
+# SC2039: In POSIX sh, 'local' is undefined.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+############################### Public functions ###############################
+
+# Add an entry to the XML test report.
+report_test_result_in_xml() {
+    # If GTEST_OUTPUT is not defined...
+    if ! test -n "${GTEST_OUTPUT+x}"; then
+        # There is nowhere to report.
+        return
+    fi
+
+    # Declarations
+    local test_name="${1}"; shift
+    local exit_code="${1}"; shift
+    local duration="${1}"; shift # milliseconds
+    local now
+    local test_case
+    local test_suite
+    local xml
+    now=$(date '+%FT%H:%M:%S')
+    test_suite=$(printf '%s' "${test_name}" | cut -d '.' -f 1)
+    test_case=$(printf '%s' "${test_name}" | cut -d '.' -f 2-)
+
+    # Strip the 'xml:' at the start of GTEST_OUTPUT if it is there.
+    xml="${GTEST_OUTPUT}"
+    if test "$(printf '%s' "${xml}" | cut -c 1-4)" = 'xml:'; then
+        xml=$(printf '%s' "${xml}" | cut -c 5-)
+    fi
+    xml="${xml}/${test_suite}.sh.xml"
+
+    # Convert to seconds, but keep the millisecond precision.
+    duration=$(_calculate "${duration} / 1000.0")
+
+    # For test suites that have a single test case and no name for the test
+    # case, name the test case after the test suite.
+    if test -z "${test_case}"; then
+        test_case="${test_suite}"
+    fi
+
+    # Determine result based on exit code. Googletest seems to omit the failed
+    # tests, instead we are explicitly adding them with a 'failed' result.
+    local result
+    if test "${exit_code}" -eq 0; then
+        result='success'
+    else
+        result='failed'
+    fi
+
+    _create_xml "${xml}" "${now}"
+
+    _add_test_suite "${test_suite}" "${xml}" "${now}"
+
+    _add_test_case "${test_suite}" "${test_case}" "${result}" "${duration}" \
+        "${xml}" "${now}"
+}
+
+############################## Private functions ###############################
+
+# Add ${string} after ${reference} in ${file}.
+_add_after() {
+    local string="${1}"; shift
+    local reference="${1}"; shift
+    local file="${1}"; shift
+
+    # Escape all slashes.
+    string=$(printf '%s' "${string}" | sed 's#\/#\\\/#g')
+    reference=$(printf '%s' "${reference}" | sed 's#\/#\\\/#g')
+
+    # Escape all spaces. Only trailing spaces need escaped, but that's harder
+    # and this still empirically works.
+    string=$(printf '%s' "${string}" | sed 's#\ #\\\ #g')
+    reference=$(printf '%s' "${reference}" | sed 's#\ #\\\ #g')
+
+    # Linearize. To avoid this change, add one line at a time.
+    string=$(printf '%s' "${string}" | tr '\n' ' ')
+
+    # Add ${string} after ${reference} in ${file}.
+    # The "\\" followed by newline is for BSD support.
+    sed "/${reference}/a\\
+${string}
+" "${file}" > "${file}.tmp"
+    mv "${file}.tmp" "${file}"
+}
+
+# Add ${string} before ${reference} in ${file}.
+_add_before() {
+    local string="${1}"; shift
+    local reference="${1}"; shift
+    local file="${1}"; shift
+
+    # Get the line number of the reference line.
+    local line_number
+    line_number=$(grep -Fn "${reference}" "${file}" | cut -d ':' -f 1)
+
+    # Escape all slashes.
+    string=$(printf '%s' "${string}" | sed 's#\/#\\\/#g')
+    reference=$(printf '%s' "${reference}" | sed 's#\/#\\\/#g')
+
+    # Escape all spaces. Only trailing spaces need escaped, but that's harder
+    # and this still empirically works.
+    string=$(printf '%s' "${string}" | sed 's#\ #\\\ #g')
+    reference=$(printf '%s' "${reference}" | sed 's#\ #\\\ #g')
+
+    # Linearize. To avoid this change, add one line at a time.
+    string=$(printf '%s' "${string}" | tr '\n' ' ')
+
+    # Add ${string} before ${reference} in ${file}.
+    # The "\\" followed by newline is for BSD support.
+    sed "${line_number}i\\
+${string}
+" "${file}" > "${file}.tmp"
+    mv "${file}.tmp" "${file}"
+}
+
+_add_failure_tag() {
+    local test_case_tag="${1}"; shift
+    local xml="${1}"; shift
+
+    local closing_tag='    </testcase>'
+    local failure_tag
+    local failure_text
+    local linearized_failure_text
+    # Remove characters which are suspected to not be allowed in:
+    # * sed
+    # * XML attribute values
+    # * XML CDATA
+    failure_text=$(printf '%s\n%s' "${ERROR-}" "${OUTPUT-}" | \
+        sed 's/"/ /g' | sed 's/\[/ /g' | sed 's/\]/ /g')
+    linearized_failure_text=$(printf '%s' "${failure_text}" | tr '\n' ' ')
+    failure_tag=$(printf '      <failure message="%s" type=""><![CDATA[%s]]></failure>' \
+        "${linearized_failure_text}" "${failure_text}")
+
+    # Add.
+    _add_after "${closing_tag}" "${test_case_tag}" "${xml}"
+    _add_after "${failure_tag}" "${test_case_tag}" "${xml}"
+}
+
+# Add test result if not in file.
+_add_test_case() {
+    local test_suite="${1}"; shift
+    local test_case="${1}"; shift
+    local result="${1}"; shift
+    local duration="${1}"; shift
+    local xml="${1}"; shift
+    local now="${1}"; shift
+
+    # Determine the test case tag.
+    local closing_backslash
+    local closing_tag
+    if test "${result}" = 'success'; then
+        closing_backslash=' /'
+    else
+        closing_backslash=
+    fi
+
+    # Create the test XML tag.
+    local test_case_line
+    test_case_line=$(printf '    <testcase name="%s" status="run" result="completed" time="%s" timestamp="%s" classname="%s"%s>' \
+        "${test_case}" "${duration}" "${now}" "${test_suite}" \
+        "${closing_backslash}")
+
+    # Add this test case to all the other test cases.
+    local all_test_cases
+    all_test_cases=$(_print_lines_between_matching_patterns \
+        "  <testsuite name=\"${test_suite}\"" '  </testsuite>' "${xml}")
+    all_test_cases=$(printf '%s\n%s' "${all_test_cases}" "${test_case_line}")
+
+    # Find the test following this one.
+    local following_line
+    following_line=$(printf '%s' "${all_test_cases}" | \
+        grep -A1 -F "${test_case_line}" | \
+        grep -Fv "${test_case_line}" || true)
+    if test -n "${following_line}"; then
+        # If found, add it before.
+        _add_before "${test_case_line}" "${following_line}" "${xml}"
+    else
+        # Find the test before this one.
+        local previous_line
+        previous_line=$(printf '%s' "${all_test_cases}" | \
+            grep -B1 -F "${test_case_line}" | \
+            grep -Fv "${test_case_line}" || true)
+        if test -n "${previous_line}"; then
+            # If found, add it after.
+            _add_after "${test_case_line}" "${previous_line}" "${xml}"
+        else
+            # If neither were found, add it as the first test case following the test
+            # suite line.
+            _add_after "${test_case_line}" "  <testsuite name=\"${test_suite}\"" "${xml}"
+        fi
+    fi
+
+    # Add the failure tag if it is the case.
+    if test "${result}" != 'success'; then
+        _add_failure_tag "${test_case_line}" "${xml}"
+    fi
+
+    # Retrieve again to include the failure tag that may have just been added
+    # among other tags or lines.
+    all_test_cases=$(_print_lines_between_matching_patterns \
+        "  <testsuite name=\"${test_suite}\"" '  </testsuite>' "${xml}")
+
+    # Update attributes for the parent <testsuite> and the global <testsuites>.
+    _update_test_suite_metrics "${test_suite}" "${all_test_cases}" "${xml}" "${now}"
+}
+
+# Add a set of test suite tags if not already present in the XML.
+_add_test_suite() {
+    local test_suite="${1}"; shift
+    local xml="${1}"; shift
+    local now="${1}"; shift
+    local test_suite_line
+    local all_test_suites
+
+    # If test suite tag is already there, then there is nothing to do.
+    if grep -F "<testsuite name=\"${test_suite}\"" "${xml}" \
+        > /dev/null 2>&1; then
+        return
+    fi
+
+    # Create the test suite XML tag.
+    local test_suite_line
+    test_suite_line=$(printf '  <testsuite name="%s" tests="0" failures="0" disabled="0" errors="0" time="0" timestamp="%s">' \
+        "${test_suite}" "${now}")
+
+    # Add this test suite to all the other test suites and sort them.
+    local all_test_suites
+    all_test_suites=$(printf '%s\n%s' "  ${test_suite_line}" \
+        "$(grep -E '  <testsuite name=|</testsuites>' "${xml}")")
+
+    # Find the test suite following this one.
+    local following_line
+    following_line=$(printf '%s' "${all_test_suites}" | \
+        grep -A1 -F "${test_suite_line}" | \
+        grep -Fv "${test_suite_line}" || true)
+
+    # Add the test suite tag to the XML.
+    _add_before "${test_suite_line}" "${following_line}" "${xml}"
+    _add_after '  </testsuite>' "${test_suite_line}" "${xml}"
+}
+
+# Calculate the given mathematical expression and print it in a format that
+# matches googletest's time in the XML attribute time="..." which is seconds
+# rounded to 3 decimals.
+_calculate() {
+    awk "BEGIN{print ${*}}";
+}
+
+# Create XML with header and top-level tags if the file doesn't exist.
+_create_xml() {
+    # If file exists and we have set GTEST_OUTPUT_CREATED previously, then there
+    # is nothing to do.
+    if test -f "${xml}" && test -n "${GTEST_OUTPUT_CREATED+x}"; then
+        return;
+    fi
+
+    local xml="${1}"; shift
+    local now="${1}"; shift
+
+    mkdir -p "$(dirname "${xml}")"
+    printf \
+'<?xml version="1.0" encoding="UTF-8"?>
+<testsuites tests="0" failures="0" disabled="0" errors="0" time="0" timestamp="%s" name="AllTests">
+</testsuites>
+' "${now}" > "${xml}"
+
+    # GTEST_OUTPUT_CREATED is not a googletest variable, but our way of allowing
+    # to overwrite XMLs created in a previous test run. The lifetime of
+    # GTEST_OUTPUT_CREATED is extended to the oldest ancestor file who has
+    # sourced this script i.e. the *_test.sh file. So it gets lost from one
+    # *_test.sh to another. The consensus that need to be kept so that this
+    # works correctly are:
+    #   * Needless to say, don't set this variable on your own.
+    #   * Always call these scripts directly or through `make check`.
+    # Never source test files e.g. `source memfile_tests.sh` or
+    # `. memfile_tests.sh`.
+    #   * The ${xml} passed here must be deterministically and uniquely
+    # attributed to the *_test.sh. At the time of this writing, ${xml} is the
+    # part of the name before the dot. So for example, for memfile, all tests
+    # should start with the same thing e.g. `memfile.*`.
+    export GTEST_OUTPUT_CREATED=true
+}
+
+# Print the lines between two matching regex patterns from a file. Excludes the
+# lines that contain the patterns themselves. Matches only the first occurrence.
+_print_lines_between_matching_patterns() {
+    local start_pattern="${1}"; shift
+    local end_pattern="${1}"; shift
+    local file="${1}"; shift
+
+    # Escape all slashes.
+    start_pattern=$(printf '%s' "${start_pattern}" | sed 's#\/#\\\/#g')
+    end_pattern=$(printf '%s' "${end_pattern}" | sed 's#\/#\\\/#g')
+
+    # Print with sed.
+    sed -n "/${start_pattern}/,/${end_pattern}/p;/${end_pattern}/q" "${file}" \
+        | sed '$d' | tail -n +2
+}
+
+# Update the test suite XML attributes with metrics collected from the child
+# test cases.
+_update_test_suite_metrics() {
+    local test_suite="${1}"; shift
+    local all_test_cases="${1}"; shift
+    local xml="${1}"; shift
+    local now="${1}"; shift
+
+    # Get the metrics on the parent test suite.
+    local duration
+    local durations_summed
+    local failures
+    local tests
+    tests=$(printf '%s' "${all_test_cases}" | \
+        grep -Fc '<testcase' || true)
+    failures=$(printf '%s' "${all_test_cases}" | \
+        grep -Fc '<failure' || true)
+    durations_summed=$(printf '%s' "${all_test_cases}" | \
+        grep -Eo 'time="[0-9.]+"' | cut -d '"' -f 2 | xargs | sed 's/ / + /g')
+    duration=$(_calculate "${durations_summed}")
+
+    # Create the test suite XML tag.
+    local test_suite_line
+    test_suite_line=$(printf '  <testsuite name="%s" tests="%s" failures="%s" disabled="0" errors="0" time="%s" timestamp="%s">' \
+        "${test_suite}" "${tests}" "${failures}" "${duration}" "${now}")
+
+    # Update the test suite with the collected metrics.
+    sed "s#  <testsuite name=\"${test_suite}\".*>#${test_suite_line}#g" \
+        "${xml}" > "${xml}.tmp"
+    mv "${xml}.tmp" "${xml}"
+
+    # Create the test suites XML tag.
+    local test_suites_line
+    test_suites_line=$(printf '<testsuites tests="%s" failures="%s" disabled="0" errors="0" time="%s" timestamp="%s" name="AllTests">' \
+        "${tests}" "${failures}" "${duration}" "${now}")
+
+    # Update the test suites with the collected metrics.
+    sed "s#<testsuites .*>#${test_suites_line}#g" \
+        "${xml}" > "${xml}.tmp"
+    mv "${xml}.tmp" "${xml}"
+}