diff --git a/tests/find-target.sh b/tests/find-target.sh
index b371acc..7ebafaf 100755
--- a/tests/find-target.sh
+++ b/tests/find-target.sh
@@ -62,8 +62,8 @@ function cleanup {
 trap cleanup EXIT
 
 # Reduce the size of the screen capture and the target to optimize the search performance.
-convert ${SCREEN} -resize $((100 / SCALE_FACTOR))% "${WORK_DIR}/screen_small.png"
-convert ${TARGET} -resize $((100 / SCALE_FACTOR))% "${WORK_DIR}/target_small.png"
+convert "${SCREEN}" -resize $((100 / SCALE_FACTOR))% "${WORK_DIR}/screen_small.png"
+convert "${TARGET}" -resize $((100 / SCALE_FACTOR))% "${WORK_DIR}/target_small.png"
 
 # Make a search on the reduced images.
 RESULT=$(compare -metric MSE -subimage-search \
@@ -104,7 +104,7 @@ convert "${SCREEN}" -crop ${CROP_WIDTH}x${CROP_HEIGHT}+${CROP_X}+${CROP_Y} \
         +repage "${WORK_DIR}/screen_cropped.png"
 
 # Search again on the full resolution.
-RESULT=$(compare -metric MSE -dissimilarity-threshold ${FUZZINESS} -subimage-search \
+RESULT=$(compare -metric MSE -dissimilarity-threshold "${FUZZINESS}" -subimage-search \
       "${WORK_DIR}/screen_cropped.png" "${TARGET}" "${WORK_DIR}/out.png" 2>&1)
 
 if [[ $RESULT == *"error"* ]]; then
diff --git a/tests/run-test.sh b/tests/run-test.sh
index 5ab0424..f3690f7 100755
--- a/tests/run-test.sh
+++ b/tests/run-test.sh
@@ -58,11 +58,6 @@ cd "$( cd "$( dirname "$0" )" && pwd )/.." || \
 IMAGE="ghcr.io/schneegans/gnome-shell-pod-${FEDORA_VERSION}"
 EXTENSION="burn-my-windows@schneegans.github.com"
 
-# All references images of the effects are captured at & cropped to this region
-# in the center of the screen. This is kind of arbitrary, but has been choosen so that
-# something is visible from each effect.
-CROP="100x100+910+480"
-
 # Run the container. For more info, visit https://github.com/Schneegans/gnome-shell-pod.
 POD=$(podman run --rm --cap-add=SYS_NICE --cap-add=IPC_LOCK -td "${IMAGE}")