create eventUtilTest

js/lib/eventUtil.js

@@ -11,8 +11,9 @@ module.exports.isForSecondaryAction = (e) =>
 
 module.exports.eventElHasAncestorWithClasses = (e, classesToCheck) => {
   // DO NOT ADD NEW CHECKS USING THIS METHOD
-  // classNames are changed from dev to prod by Aphrodite
+  // classNames are changed from dev to prod by Aphrodite est. v1.2.3
   // and new code will not work. Consider using dataset attribute instead.
+  // See issue #10029 for a breaking example.
   // ....
   // TODO deprecate this method.
   let node = e.target

test/unit/js/lib/eventUtilTest.js

@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+/* global describe, it */
+
+const eventUtil = require('../../../../js/lib/eventUtil')
+const assert = require('assert')
+
+require('../../braveUnit')
+
+describe('eventUtil', function () {
+  describe('elementHasDataset', function () {
+    let datasetToTest
+    let node = { dataset: { nespresso: true } }
+
+    it('returns false if node dataset do not match', function () {
+      datasetToTest = ['starbucks', 'keurig']
+      assert.equal(eventUtil.elementHasDataset(node, datasetToTest), false)
+    })
+    it('returns true if node dataset match the provided dataset array', function () {
+      datasetToTest = ['wow', 'such', 'nespresso', 'very', 'amazing']
+      assert.equal(eventUtil.elementHasDataset(node, datasetToTest), true)
+    })
+    it('can accept strings for the dataset to match against', function () {
+      datasetToTest = 'nespresso'
+      assert.equal(eventUtil.elementHasDataset(node, datasetToTest), true)
+    })
+    it('can not accept partial string match', function () {
+      datasetToTest = ['nespressomnibox']
+      assert.equal(eventUtil.elementHasDataset(node, datasetToTest), false)
+    })
+    it('returns false if node do not provide a dataset', function () {
+      node = delete node.dataset
+      datasetToTest = ['nespresso']
+      assert.equal(eventUtil.elementHasDataset(node, datasetToTest), false)
+    })
+  })
+})