Adding upstream version 2.4.1.upstream/2.4.1upstream

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

4 files changed, 1619 insertions, 0 deletions

diff --git a/src/lib/config_backend/tests/Makefile.am b/src/lib/config_backend/tests/Makefile.am
new file mode 100644
index 0000000..a58d143
--- /dev/null
+++ b/src/lib/config_backend/tests/Makefile.am
@@ -0,0 +1,37 @@
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diff --git a/src/lib/config_backend/tests/Makefile.in b/src/lib/config_backend/tests/Makefile.in
new file mode 100644
index 0000000..95f2bac
--- /dev/null
+++ b/src/lib/config_backend/tests/Makefile.in
@@ -0,0 +1,1006 @@
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+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
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+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS)
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+install-strip:
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libcb_unittests-config_backend_mgr_unittest.Po
+	-rm -f ./$(DEPDIR)/libcb_unittests-run_unittests.Po
+	-rm -f Makefile
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+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
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+	install-ps install-ps-am install-strip installcheck \
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+
+.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/config_backend/tests/config_backend_mgr_unittest.cc b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
new file mode 100644
index 0000000..09645e3
--- /dev/null
+++ b/src/lib/config_backend/tests/config_backend_mgr_unittest.cc
@@ -0,0 +1,557 @@
+// Copyright (C) 2018-2023 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/.
+
+#include <config.h>
+
+#include <config_backend/base_config_backend_mgr.h>
+#include <config_backend/base_config_backend_pool.h>
+#include <config_backend/base_config_backend.h>
+#include <database/database_connection.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <list>
+#include <string>
+#include <utility>
+
+using namespace isc;
+using namespace isc::cb;
+using namespace isc::db;
+
+namespace {
+
+/// @brief Defines list of properties retrieved by @c TestConfigBackend.
+///
+/// A single property is a name/value pair, where value is an integer.
+typedef std::list<std::pair<std::string, int> > PropertiesList;
+
+/// @brief Implements configuration backend used in tests.
+///
+/// @c BaseConfigBackend is an abstract class that must be implemented
+/// in order to allow us to test mechanisms implemented in
+/// @c BaseConfigBackendMgr and @c BaseConfigBackendPool.
+///
+/// Normally, a class derived directly from the @c BaseConfigBackend
+/// will merely provide an interface for server specific operations,
+/// e.g. DHCPv4 specific operations, and the database specific classes
+/// will implement this interface. However, for the test purposes it
+/// is convenient to implement them here and let the derivations
+/// only provide the implementations of the @c getType, @c getHost
+/// and @c getPort functions. That way, the logic for adding and
+/// retrieving the data from the backend is implemented only once and
+/// is common accross all test backends.
+///
+/// This class provides a logic for managing test data being a collection
+/// of name/value pairs, i.e. "properties". It contains a list of
+/// properties and the functions for adding the properties, retrieving
+/// a single property and retrieving a collection of properties.
+class TestConfigBackend : public BaseConfigBackend {
+public:
+
+    /// @brief Retrieves first property having a given name.
+    ///
+    /// @param property_name Name of the property to be retrieved.
+    /// @return Value of the property or 0 if property doesn't exist.
+    virtual int getProperty(const ServerSelector&,
+                            const std::string& property_name) const {
+        for (auto property : properties_) {
+            if (property.first == property_name) {
+                return (property.second);
+            }
+        }
+        return (0);
+    }
+
+    /// @brief Retrieves first property matching the name and value.
+    ///
+    /// @param property_name Name of the property to be retrieved.
+    /// @param property_value Value of the property to be retrieved.
+    /// @return Value of the property or 0 if the property doesn't exist.
+    virtual int getProperty(const ServerSelector&,
+                            const std::string& property_name,
+                            const int property_value) const {
+        for (auto property : properties_) {
+            if ((property.first == property_name) &&
+                (property.second == property_value)) {
+                return (property.second);
+            }
+        }
+        return (0);
+    }
+
+    /// @brief Retrieves all properties having a given name.
+    ///
+    /// @param property_name Name of the properties to be retrieved.
+    /// @return List of the properties having a given name. This list is
+    /// empty if no property was found.
+    virtual PropertiesList getProperties(const ServerSelector&,
+                                         const std::string& property_name) const {
+        PropertiesList properties;
+        for (auto property : properties_) {
+            if (property.first == property_name) {
+                properties.push_back(property);
+            }
+        }
+        return (properties);
+    }
+
+    /// @brief Retrieves all properties.
+    ///
+    /// @return List of all properties held in the backend.
+    virtual PropertiesList getAllProperties(const ServerSelector&) const {
+        return (properties_);
+    }
+
+    /// @brief Creates new property.
+    ///
+    /// @param new_property Property to be added to the backend.
+    virtual void createProperty(const ServerSelector&,
+                                const std::pair<std::string, int>& new_property) {
+        properties_.push_back(new_property);
+    }
+
+protected:
+
+    /// @brief Holds list of properties (simulates database).
+    PropertiesList properties_;
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackend.
+typedef boost::shared_ptr<TestConfigBackend> TestConfigBackendPtr;
+
+/// @brief First implementation of the test config backend.
+///
+/// It simulates being a MySQL backend installed on the
+/// "mysql-host" host and running on port 2345.
+class TestConfigBackendImpl1 : public TestConfigBackend {
+public:
+
+    /// @brief Returns backend type.
+    ///
+    /// @return "mysql".
+    virtual std::string getType() const {
+        return (std::string("mysql"));
+    }
+
+    /// @brief Returns backend host.
+    ///
+    /// @return "mysql-host".
+    virtual std::string getHost() const {
+        return (std::string("mysql-host"));
+    }
+
+    /// @brief Returns backend port.
+    ///
+    /// @return Port number 2345.
+    virtual uint16_t getPort() const {
+        return (2345);
+    }
+
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl1.
+typedef boost::shared_ptr<TestConfigBackendImpl1> TestConfigBackendImpl1Ptr;
+
+/// @brief Second implementation of the test config backend.
+///
+/// It simulates being a Postgres backend installed on the
+/// "postgresql-host" host and running on port 1234.
+class TestConfigBackendImpl2 : public TestConfigBackend {
+public:
+
+    /// @brief Returns backend type.
+    ///
+    /// @return "postgresql".
+    virtual std::string getType() const {
+        return (std::string("postgresql"));
+    }
+
+    /// @brief Returns backend host.
+    ///
+    /// @return "postgresql-host".
+    virtual std::string getHost() const {
+        return (std::string("postgresql-host"));
+    }
+
+    /// @brief Returns backend port.
+    ///
+    /// @return Port number 1234.
+    virtual uint16_t getPort() const {
+        return (1234);
+    }
+};
+
+/// @brief Shared pointer to the @c TestConfigBackendImpl2.
+typedef boost::shared_ptr<TestConfigBackendImpl2> TestConfigBackendImpl2Ptr;
+
+/// @brief Implements test pool of configuration backends.
+///
+/// @c BaseConfigBackendPool template provides mechanics for managing the data
+/// stored in multiple backends. Server specific pools must extend this class
+/// with methods for managing the data appropriate for the server types.
+/// This class provides an example pool implementation for managing the
+/// "properties" being name/value pairs. It extends the base class with
+/// new methods to retrieve a single property and multiple properties. It
+/// also adds a method to create new property. Those methods correspond to
+/// the ones implemented in the @c TestConfigBackend, but also each of
+/// them includes a "database selector" used to indicate the backend to
+/// be used.
+class TestConfigBackendPool : public BaseConfigBackendPool<TestConfigBackend> {
+public:
+
+    /// @brief Retrieves a value of the property.
+    ///
+    /// @param property_name Name of the property which value should be returned.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the property will be searched in all backends
+    /// and the first value found will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the property for all servers will be returned.
+    virtual int getProperty(const std::string& property_name,
+                            const BackendSelector& backend_selector =
+                            BackendSelector::UNSPEC(),
+                            const ServerSelector& server_selector =
+                            ServerSelector::ALL()) const {
+        int property = 0;
+
+        // If the selector is specified, this method will pick the appropriate
+        // backend and will call getProperty method on this backend. If the
+        // selector is not specified, this method will iterate over existing
+        // backends and call getProperty on them. It will return after finding
+        // the first non-zero value of the property. For example, if the first
+        // backend contains a non-zero value this value will be returned and
+        // the value held in the second backend (if any) won't be fetched.
+        // The template arguments specify the returned value type and the
+        // argument of the getProperty method.
+        getPropertyPtrConst<int, const std::string&>
+            (&TestConfigBackend::getProperty, backend_selector, server_selector,
+             property, property_name);
+        return (property);
+    }
+
+    /// @brief Retrieves value of the property.
+    ///
+    /// @param property_name Name of the property which value should be returned.
+    /// @param property_value Value of the property to be retrieved.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the property will be searched in all backends
+    /// and the first value found will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the property for all servers will be returned.
+    virtual int getProperty(const std::string& property_name,
+                            const int property_value,
+                            const BackendSelector& backend_selector =
+                            BackendSelector::UNSPEC(),
+                            const ServerSelector& server_selector =
+                            ServerSelector::ALL()) const {
+        int property = 0;
+
+        getPropertyPtrConst<int, const std::string&, int>
+            (&TestConfigBackend::getProperty, backend_selector, server_selector,
+             property, property_name, property_value);
+        return (property);
+    }
+
+
+    /// @brief Retrieves multiple properties.
+    ///
+    /// @param property_name Name of the properties which should be retrieved.
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the properties will be searched in all
+    /// backends and the first non-empty list will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the properties for all servers will be returned.
+    virtual PropertiesList getProperties(const std::string& property_name,
+                                         const BackendSelector& backend_selector =
+                                         BackendSelector::UNSPEC(),
+                                         const ServerSelector& server_selector =
+                                         ServerSelector::ALL()) const {
+        PropertiesList properties;
+
+        // If the selector is specified, this method will pick the appropriate
+        // backend and will call getProperties method on this backend. If the
+        // selector is not specified, this method will iterate over existing
+        // backends and call getProperties on them. It will return after finding
+        // the first non-empty list of properties in one of the backends.
+        // The template arguments specify the type of the list of properties
+        // and the argument of the getProperties method.
+        getMultiplePropertiesConst<PropertiesList, const std::string&>
+            (&TestConfigBackend::getProperties, backend_selector, server_selector,
+             properties, property_name);
+        return (properties);
+    }
+
+    /// @brief Retrieves all properties.
+    ///
+    /// @param backend_selector Backend selector. The default value of the selector
+    /// is @c UNSPEC which means that the properties will be searched in all
+    /// backends and the first non-empty list will be returned.
+    /// @param server_selector Server selector. The default value is set to @c ALL,
+    /// which means that the properties for all servers will be returned.
+    virtual PropertiesList getAllProperties(const BackendSelector& backend_selector =
+                                            BackendSelector::UNSPEC(),
+                                            const ServerSelector& server_selector =
+                                            ServerSelector::ALL()) const {
+        PropertiesList properties;
+
+        // This method is similar to getMultiplePropertiesConst but it lacks
+        // an argument and it simply returns all properties.
+        getAllPropertiesConst<PropertiesList>
+            (&TestConfigBackend::getAllProperties, backend_selector, server_selector,
+             properties);
+        return (properties);
+    }
+
+    /// @brief Creates new property in a selected backend.
+    ///
+    /// @param new_property New property to be added to a backend.
+    /// @param backend_selector Backend selector. It has no default value.
+    /// @param server_selector The default value is @c ALL which means that
+    /// new property is going to be shared by all servers.
+    virtual void createProperty(const std::pair<std::string, int>& new_property,
+                                const BackendSelector& backend_selector,
+                                const ServerSelector& server_selector =
+                                ServerSelector::ALL()) {
+        createUpdateDeleteProperty<void, const std::pair<std::string, int>&>
+            (&TestConfigBackend::createProperty, backend_selector, server_selector,
+             new_property);
+    }
+};
+
+using TestConfigBackendMgr = BaseConfigBackendMgr<TestConfigBackendPool>;
+
+/// @brief Test fixture class for testing @c ConfigBackendMgr.
+class ConfigBackendMgrTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ConfigBackendMgrTest()
+        : config_mgr_() {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes backend instances.
+    ~ConfigBackendMgrTest() {
+        config_mgr_.delAllBackends();
+    }
+
+    /// @brief Creates example database backend called "mysql".
+    ///
+    /// It uses @c TestConfigBackendImpl1.
+    void addTestMySQLBackend() {
+        config_mgr_.registerBackendFactory("mysql", [](const DatabaseConnection::ParameterMap&)
+                                          -> TestConfigBackendPtr {
+            return (TestConfigBackendImpl1Ptr(new TestConfigBackendImpl1()));
+        });
+
+        config_mgr_.addBackend("type=mysql");
+    }
+
+    /// @brief Creates example database backend called "postgresql".
+    ///
+    /// It uses @c TestConfigBackendImpl2.
+    void addTestPgSQLBackend() {
+        config_mgr_.registerBackendFactory("postgresql", [](const DatabaseConnection::ParameterMap&)
+                                          -> TestConfigBackendPtr {
+            return (TestConfigBackendImpl2Ptr(new TestConfigBackendImpl2()));
+        });
+
+        // Actually create the backends.
+        config_mgr_.addBackend("type=postgresql");
+    }
+
+    /// @brief Creates two example database backends called "mysql" and "postgresql".
+    ///
+    /// It uses @c TestConfigBackendImpl1 and @c TestConfigBackendImpl2.
+    void addTestBackends() {
+        addTestMySQLBackend();
+        addTestPgSQLBackend();
+    }
+
+    /// @brief Adds test data into the backends.
+    void addTestData() {
+        // Add two properties with different names into the first backend.
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                             BackendSelector(BackendSelector::Type::MYSQL));
+        config_mgr_.getPool()->createProperty(std::make_pair("wolves", 3),
+                                             BackendSelector(BackendSelector::Type::MYSQL));
+
+        // Add two properties into the second backend. Both properties share the
+        // name so as we can test retrieving multiple records from the same backend.
+        config_mgr_.getPool()->createProperty(std::make_pair("cats", 2),
+                                             BackendSelector(BackendSelector::Type::POSTGRESQL));
+        config_mgr_.getPool()->createProperty(std::make_pair("cats", 4),
+                                             BackendSelector(BackendSelector::Type::POSTGRESQL));
+    }
+
+    /// Instance of the test configuration manager.
+    TestConfigBackendMgr config_mgr_;
+};
+
+// Test that selector can be left "unspecified" if there is only one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertySingleBackendUnspec) {
+    addTestMySQLBackend();
+
+    ASSERT_NO_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::UNSPEC))
+    );
+
+    // We should be able to retrieve stored value without having to specify
+    // the backend.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+}
+
+// Test that selector must be specified if there is more than one backend,
+// when manipulating the data.
+TEST_F(ConfigBackendMgrTest, createPropertyTwoBackendsUnspec) {
+    addTestBackends();
+
+    // Backend must be selected if there is more than one backend present.
+    EXPECT_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::UNSPEC)),
+        NoSuchDatabase
+    );
+}
+
+// Test that exception is thrown when multiple backends are selected.
+TEST_F(ConfigBackendMgrTest, createPropertyAmbiguousSelection) {
+    addTestBackends();
+
+    // Add another MySQL backend to cause the selection to give ambiguous
+    // result.
+    config_mgr_.addBackend("type=mysql");
+
+    EXPECT_THROW(
+        config_mgr_.getPool()->createProperty(std::make_pair("dogs", 1),
+                                              BackendSelector(BackendSelector::Type::MYSQL)),
+        AmbiguousDatabase
+    );
+}
+
+// Test that a single property can be retrieved from a selected backend.
+TEST_F(ConfigBackendMgrTest, getSingleProperty) {
+
+    addTestBackends();
+    addTestData();
+
+    // Backend is not specified, so it should find the dogs in first one and
+    // cats in the second one.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs"));
+    EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats"));
+
+    // No dogs in the postgresql backend and no cats in mysql backend.
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs",
+                                                   BackendSelector(BackendSelector::Type::POSTGRESQL)));
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("cats",
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // If the selectors are pointing to the right databases, the dogs and cats
+    // should be returned properly.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs",
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+    EXPECT_EQ(2, config_mgr_.getPool()->getProperty("cats",
+                                                   BackendSelector(BackendSelector::Type::POSTGRESQL)));
+
+    // Also make sure that the variant of getProperty function taking two arguments
+    // would return the value.
+    EXPECT_EQ(1, config_mgr_.getPool()->getProperty("dogs", 1,
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // If the value is not matching it should return 0.
+    EXPECT_EQ(0, config_mgr_.getPool()->getProperty("dogs", 2,
+                                                   BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperty("cats",
+                                                    BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+}
+
+// Test that multiple properties can be retrieved with filtering.
+TEST_F(ConfigBackendMgrTest, getMultipleProperties) {
+
+    addTestBackends();
+    addTestData();
+
+    // There is one dogs entry in mysql.
+    PropertiesList mysql_list =
+        config_mgr_.getPool()->getProperties("dogs",
+                                            BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(1, mysql_list.size());
+
+    // There is also one wolves entry in mysql.
+    mysql_list = config_mgr_.getPool()->getProperties("wolves",
+                                                     BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(1, mysql_list.size());
+
+    // There are two cats entries in postgresql.
+    PropertiesList postgresql_list =
+        config_mgr_.getPool()->getProperties("cats",
+                                            BackendSelector(BackendSelector::Type::POSTGRESQL));
+    ASSERT_EQ(2, postgresql_list.size());
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                      BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+
+}
+
+// Test that all properties can be retrieved from each backend.
+TEST_F(ConfigBackendMgrTest, getAllProperties) {
+
+    addTestBackends();
+    addTestData();
+
+    // The mysql backend holds two entries.
+    PropertiesList mysql_list =
+        config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::MYSQL));
+    ASSERT_EQ(2, mysql_list.size());
+
+    // The postgresql backends also holds two entries.
+    PropertiesList postgresql_list =
+        config_mgr_.getPool()->getAllProperties(BackendSelector(BackendSelector::Type::POSTGRESQL));
+    ASSERT_EQ(2, postgresql_list.size());
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                      BackendSelector(static_cast<BackendSelector::Type>(-1))),
+                 NoSuchDatabase);
+}
+
+// Verify that unregistering a factory works.
+TEST_F(ConfigBackendMgrTest, unregister) {
+
+    // Verify we can't remove what is not there.
+    ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Add both MySQL and Postgresql backends
+    addTestBackends();
+
+    // Backend should be present.
+    EXPECT_NO_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                         BackendSelector(BackendSelector::Type::MYSQL)));
+
+    // Verify that unregistering MySQL factory returns true.
+    ASSERT_TRUE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Verify that the factory is actually gone.
+    ASSERT_THROW(config_mgr_.addBackend("type=mysql"), db::InvalidType);
+
+    // Verify we can't remove what is not there.
+    ASSERT_FALSE(config_mgr_.unregisterBackendFactory("mysql"));
+
+    // Try to use the backend that is not present.
+    EXPECT_THROW(config_mgr_.getPool()->getProperties("cats",
+                                                       BackendSelector(BackendSelector::Type::MYSQL)),
+                 NoSuchDatabase);
+}
+
+}
diff --git a/src/lib/config_backend/tests/run_unittests.cc b/src/lib/config_backend/tests/run_unittests.cc
new file mode 100644
index 0000000..6754d66
--- /dev/null
+++ b/src/lib/config_backend/tests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2018 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 <log/logger_support.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}