1 files changed, 78 insertions, 0 deletions
diff --git a/testfiles/cli_tests/check_output.sh b/testfiles/cli_tests/check_output.sh
new file mode 100644
index 0000000..06da1fa
--- /dev/null
+++ b/testfiles/cli_tests/check_output.sh
@@ -0,0 +1,78 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+command -v convert >/dev/null 2>&1 || { echo >&2 "I require ImageMagick's 'convert' but it's not installed.  Aborting."; exit 1; }
+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
+
+# check if expected files exist
+for file in ${EXPECTED_FILES}; do
+    test -f "${file}" || { echo "Error: Expected file '${file}' not found."; exit 1; }
+done
+
+# if reference file is given check if input files exist and continue with comparison
+if [ -n "${REFERENCE_FILENAME}" ]; then
+    if [ ! -f "${OUTPUT_FILENAME}" ]; then
+        echo "Error: Test file '${OUTPUT_FILENAME}' not found."
+        exit 1
+    fi
+    if [ ! -f "${REFERENCE_FILENAME}" ]; then
+        echo "Error: Reference file '${REFERENCE_FILENAME}' not found."
+        exit 1
+    fi
+
+    # convert testfile and reference file to PNG format
+    # - 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} ${OUTPUT_FILENAME}.png; then
+        echo "Warning: Failed to convert test file '${OUTPUT_FILENAME}' to PNG format. Skipping comparison test."
+        exit 42
+    fi
+    if ! convert ${delegate2}${REFERENCE_FILENAME} ${OUTPUT_FILENAME}_reference.png; then
+        echo "Warning: Failed to convert reference file '${REFERENCE_FILENAME}' to PNG format. Skipping comparison test."
+        exit 42
+    fi
+
+    # compare files
+    if ! compare -metric AE ${OUTPUT_FILENAME}.png ${OUTPUT_FILENAME}_reference.png ${OUTPUT_FILENAME}_compare.png; then
+        echo && echo "Error: Comparison failed."
+        exit 1
+    fi
+fi
+
+# if additional test file is specified, check existence and execute the command
+if [ -n "${TEST_SCRIPT}" ]; then
+    script=${TEST_SCRIPT%%;*}
+    arguments=${TEST_SCRIPT#*;}
+    IFS_OLD=$IFS IFS=';' arguments_array=($arguments) IFS=$IFS_OLD
+
+    if [ ! -f "${script}" ]; then
+        echo "Error: Additional test script file '${script}' not found."
+        exit 1
+    fi
+
+    case ${script} in
+        *.py)
+            interpreter=python3
+            ;;
+        *)
+            interpreter=sh
+            ;;
+    esac
+
+    if ! $interpreter ${script} "${arguments_array[@]}"; then
+        echo "Error: Additional test script failed."
+        echo "Full call: $interpreter ${script} $(printf "\"%s\" " "${arguments_array[@]}")"
+        exit 1
+    fi
+fi
+
+# cleanup
+for file in ${OUTPUT_FILENAME}{,.png,_reference.png,_compare.png} ${EXPECTED_FILES}; do
+    rm -f ${file}
+done