Description: partial patch from upstream to ease the next patch
Origin: upstream, 699da8c402e8fce05b08021d1bfff779499d711c
Last-Update: 2022-12-18

--- a/testfiles/cli_tests/CMakeLists.txt
+++ b/testfiles/cli_tests/CMakeLists.txt
@@ -8,6 +8,7 @@
 # Command line options:
 #   INPUT_FILENAME     - name of input file (optional)
 #   OUTPUT_FILENAME    - name of output file (optional)
+#   OUTPUT_PAGE        - index of page in multipage output (optional), starts from 0
 #   PARAMETERS         - additional command line parameters to pass to Inkscape
 #
 # Pass/fail criteria:
@@ -17,6 +18,7 @@
 #                        see https://cmake.org/cmake/help/latest/prop_test/FAIL_REGULAR_EXPRESSION.html for details
 #   REFERENCE_FILENAME - compare OUTPUT_FILENAME with this pre-rendered reference file
 #                        both files are converted to PNG and compared with ImageMagick's 'compare'
+#                        for multipage output, use OUTPUT_PAGE to specify a single page for comparison
 #   EXPECTED_FILES     - verify the command produced the expected files (i.e. they exist on disk)
 #   TEST_SCRIPT        - additional script to run after performing all checks and before cleaning up
 #
@@ -24,7 +26,7 @@
 #   ENVIRONMENT        - Additional environment variables to set while running the test
 function(add_cli_test name)
     # parse arguments
-    set(oneValueArgs INPUT_FILENAME OUTPUT_FILENAME PASS_FOR_OUTPUT FAIL_FOR_OUTPUT REFERENCE_FILENAME)
+    set(oneValueArgs INPUT_FILENAME OUTPUT_FILENAME OUTPUT_PAGE PASS_FOR_OUTPUT FAIL_FOR_OUTPUT REFERENCE_FILENAME)
     set(multiValueArgs PARAMETERS EXPECTED_FILES TEST_SCRIPT ENVIRONMENT)
     cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 
@@ -78,7 +80,8 @@
 
         add_test(NAME ${testname}_check_output
             COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/check_output.sh
-                    "${ARG_OUTPUT_FILENAME}" "${ARG_REFERENCE_FILENAME}" "${ARG_EXPECTED_FILES}" "${ARG_TEST_SCRIPT}")
+            "${ARG_OUTPUT_FILENAME}" "${ARG_OUTPUT_PAGE}" "${ARG_REFERENCE_FILENAME}"
+            "${ARG_EXPECTED_FILES}" "${ARG_TEST_SCRIPT}")
         set_tests_properties(${testname}_check_output PROPERTIES
             ENVIRONMENT "${CMAKE_CTEST_ENV}" DEPENDS ${testname} SKIP_RETURN_CODE 42)
     endif()
--- a/testfiles/cli_tests/check_output.sh
+++ b/testfiles/cli_tests/check_output.sh
@@ -5,9 +5,10 @@
 command -v compare >/dev/null 2>&1 || { echo >&2 "I require ImageMagick's 'compare' but it's not installed.  Aborting."; exit 1; }
 
 OUTPUT_FILENAME=$1
-REFERENCE_FILENAME=$2
-EXPECTED_FILES=$3
-TEST_SCRIPT=$4
+OUTPUT_PAGE=$2
+REFERENCE_FILENAME=$3
+EXPECTED_FILES=$4
+TEST_SCRIPT=$5
 
 # check if expected files exist
 for file in ${EXPECTED_FILES}; do
@@ -29,7 +30,14 @@
     # - use internal MSVG delegate in SVG conversions for reproducibility reasons (avoid inkscape or rsvg delegates)
     [ "${OUTPUT_FILENAME##*.}"    = "svg" ] && delegate1=MSVG:
     [ "${REFERENCE_FILENAME##*.}" = "svg" ] && delegate2=MSVG:
-    if ! convert ${delegate1}${OUTPUT_FILENAME} ${OUTPUT_FILENAME}.png; then
+
+    # extract a page from multipage PDF if requested and convert it to RGB
+    OUTFILE_SUFFIX=""
+    if [ -n "$OUTPUT_PAGE" ]; then
+        OUTFILE_SUFFIX="[${OUTPUT_PAGE}] -colorspace RGB"
+    fi
+
+    if ! convert ${delegate1}${OUTPUT_FILENAME}${OUTFILE_SUFFIX} ${OUTPUT_FILENAME}.png; then
         echo "Warning: Failed to convert test file '${OUTPUT_FILENAME}' to PNG format. Skipping comparison test."
         exit 42
     fi
@@ -61,7 +69,7 @@
             interpreter=python3
             ;;
         *)
-            interpreter=sh
+            interpreter=bash
             ;;
     esac