add test for previous commit

+ handle if first or second parameter to magick compare is not existing file

Author: MartinPulec

test/common.sh

@@ -14,8 +14,13 @@ magick_compare() {
 
         requested_psnr=${4-$requested_psnr_dfl}
         # shellcheck disable=SC2086 # intentional
-        psnr=$(compare -metric PSNR ${3-} "${1?}" "${2?}" null: 2>&1 |
-                cut -d\  -f1 || true)
+        if output=$(compare -metric PSNR ${3-} "${1?}" "${2?}" null: 2>&1)
+        then :
+        elif [ "$?" -ne 1 ]; then # RC 1 is also ok for IM compare
+                echo "compare ERROR: $output"
+                exit 1
+        fi
+        psnr=$(echo "$output" | cut -d\  -f1)
         echo IM PSNR: "$psnr (required $requested_psnr)"
         # TODO TOREMOVE if not needed (supposing it is IM bug, not feature)
         if expr "$psnr" : '[0-9][0-9.]*$' >/dev/null &&

test/regression/run_tests.sh

@@ -150,6 +150,17 @@ test_random_psnr() {
         done
 }
 
+test_cpu_huffman_reconf_df3788e87_20260320() {
+        test_dir=testdata-test_cpu_huffman_reconf_df3788e87_20260320
+        mkdir $test_dir && cd $test_dir
+        "$GPUJPEG" -r 0 50x50.tst 50.jpg
+        "$GPUJPEG" -r 0 60x60.tst 60.jpg
+        "$GPUJPEG" -d 60.jpg 60.pnm 50.jpg 50.pnm
+        magick_compare 50.jpg 50.pnm
+        cd .. && rm $test_dir/* && rmdir $test_dir
+}
+
+tests="
 test_commit_b620be2
 test_different_sizes
 test_fix_decode_outside_pinned_AND_fix_huff_buf_partially_not_cleared
@@ -159,4 +170,10 @@ test_nonexistent
 test_out_ext_XXX
 test_pam_pnm_y4m
 test_random_psnr
+test_cpu_huffman_reconf_df3788e87_20260320
+"
 
+for n in $tests; do
+        printf "\n\n\nRunning %s...\n" "$n"
+        "$n"
+done