test: print more detail when an image diff fails

thumbsup · Sep 6, 2022 · 4a34959 · 4a34959
1 parent 5a98c56
commit 4a34959
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/test/integration/diff.js b/test/integration/diff.js
@@ -59,9 +59,12 @@ function compareMetadata (expected, actual, fields) {
 }
 
 function compareVisual (expected, actual, tolerance, done) {
-  gm.compare(expected, actual, tolerance, (err, similar, equality) => {
+  gm.compare(expected, actual, tolerance, (err, similar, equality, raw) => {
     if (err) throw err
-    should(similar).eql(true)
+    should(similar).eql(true, `
+      Equality > tolerance (${equality.toFixed(5)} > ${tolerance})
+      Raw comparison: ${raw}
+    `)
     done()
   })
 }