1 files changed, 54 insertions, 0 deletions
diff --git a/javascript/videojs/test/unit/event-target.test.js b/javascript/videojs/test/unit/event-target.test.js
new file mode 100644
index 0000000..3155655
--- /dev/null
+++ b/javascript/videojs/test/unit/event-target.test.js
@@ -0,0 +1,54 @@
+/* eslint-env qunit */
+import EventTarget from '../../src/js/event-target.js';
+import sinon from 'sinon';
+
+const { test } = QUnit;
+
+QUnit.module('EventTarget', {
+  beforeEach() {
+    this.clock = sinon.useFakeTimers();
+  },
+  afterEach() {
+    this.clock.restore();
+  }
+});
+
+test('EventTarget queueTrigger queues the event', function(t) {
+  const et = new EventTarget();
+  let changes = 0;
+  const changeHandler = function() {
+    changes++;
+  };
+
+  et.on('change', changeHandler);
+
+  et.queueTrigger('change');
+  t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
+
+  this.clock.tick(1);
+  t.equal(changes, 1, 'EventTarget triggered a change event once the clock ticked');
+  et.off('change', changeHandler);
+});
+
+test('EventTarget will only trigger event once with queueTrigger', function(t) {
+  const et = new EventTarget();
+  let changes = 0;
+  const changeHandler = function() {
+    changes++;
+  };
+
+  et.on('change', changeHandler);
+
+  et.queueTrigger('change');
+  t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
+  et.queueTrigger('change');
+  t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
+  et.queueTrigger('change');
+  t.equal(changes, 0, 'EventTarget did not trigger a change event yet');
+  et.queueTrigger('change');
+
+  this.clock.tick(100);
+  t.equal(changes, 1, 'EventTarget *only* triggered a change event once');
+
+  et.off('change', changeHandler);
+});