Script & instruction for image diff reporting

parley/tests/.gitignore

@@ -0,0 +1 @@
+report.html

parley/tests/README.md

@@ -13,4 +13,8 @@ If you think that everything is ok, you can start tests as follows:
 $ PARLEY_TEST="accept" cargo test
 ```
 
-It will update snapshots of the failed tests.
+It will update snapshots of the failed tests.
+
+## Report with diffs
+
+If you want to create a nice report with image diffs, run `make_report.sh`

parley/tests/make_report.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if ! command -v image_diff_review 2>&1 >/dev/null
+then
+    echo "image_diff_review not found. Install it via 'cargo install image_diff_review'"
+    exit 1
+fi
+
+image_diff_review --ignore-left-missing --left-title "Current test" --right-title "Snaphost" current snapshots report