Smarter fuzzy comparison for the “snapshot” integration test

test-integration/imagediff

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+const gm = require('gm')
+
+const TOLERANCE = { tolerance: 0.005 }
+const expected = process.argv[2]
+const actual = process.argv[3]
+
+gm.compare(expected, actual, TOLERANCE, (err, similar) => {
+  if (err) {
+    console.error(`Error: ${err}\n Expected: ${expected}\n Actual: ${actual}`)
+    process.exit(1)
+  }
+  if (!similar) {
+    console.error(`Images are different\n Expected: ${expected}\n Actual: ${actual}`)
+    process.exit(2)
+  }
+  process.exit(0)
+})

test-integration/test.sh

@@ -14,8 +14,19 @@ rm -rf output-actual
 # run thumbsup
 thumbsup --config config.json --output output-actual
 
-# compare with expected output (checked-in)
-diff -rub -x "metadata.json" -x "public" -x ".DS_Store" output-expected/ output-actual/
+# compare albums with the snapshot
+for expected in output-expected/*.html; do
+  actual=$(echo "${expected}" | sed s/expected/actual/)
+  diff -ub "${expected}" "${actual}"
+done
+
+# compare media with the snapshot
+IFS=$'\n'; set -f
+for expected in $(find output-expected/media -name "*.jpg"); do
+  actual=$(echo "${expected}" | sed s/expected/actual/)
+  ./imagediff "${expected}" "${actual}"
+done
+unset IFS; set +f
 
 echo "-------------------------------"
 echo "Output is identical to snapshot"