Add threshold option to test command

Author: Eduardo Lanchares

bin/email-diff.js

@@ -66,6 +66,11 @@ yargs
           default: Infinity,
           type: 'number',
         })
+        .option('threshold', {
+          describe: 'Image diff threshold',
+          default: 0.01, // 1%
+          type: 'number',
+        })
     },
     (argv) => {
       testCommand({

commands/test.js

@@ -32,7 +32,7 @@ async function getScreenshots(dir) {
 
 async function compareSnapshot(
   snapshotName,
-  { referenceDir, testDir, outputDir }
+  { referenceDir, testDir, outputDir, threshold }
 ) {
   console.log(`Comparing screenshot ${snapshotName}`)
 
@@ -45,21 +45,26 @@ async function compareSnapshot(
     ),
     imageOutputLimit: PixelDiff.OUTPUT_SIMILAR,
     thresholdType: PixelDiff.THRESHOLD_PERCENT,
-    threshold: 0.01, // 1% threshold
+    threshold: threshold,
   })
 
   return diff.runWithPromise()
 }
 
-async function command({ referenceDir, testDir, outputDir, max }) {
+async function command({ referenceDir, testDir, outputDir, max, threshold }) {
   await ensureScreenshotsDir(outputDir)
 
   const snapshots = await getScreenshots(referenceDir)
 
   console.log('Starting tests...\n')
 
   for (let snapshotName of snapshots.slice(0, max)) {
-    await compareSnapshot(snapshotName, { referenceDir, testDir, outputDir })
+    await compareSnapshot(snapshotName, {
+      referenceDir,
+      testDir,
+      outputDir,
+      threshold,
+    })
   }
 }