gr-image-diff-tool/gr-image-diff-tool_test.html

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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>image-diff-tool</title>

<link rel="import" href="../node_modules/polymer/polymer.html">
<link rel="import" href="../node_modules/@polymer/test-fixture/test-fixture.html">
<link rel="import" href="../node_modules/iron-test-helpers/iron-test-helpers.html">
<link rel="import" href="./gr-image-diff-tool.html">

<script>void(0);</script>

<script src="../node_modules/webcomponents.js/webcomponents-lite.min.js"></script>
<script src="../node_modules/web-component-tester/browser.js"></script>
<script src="../node_modules/@polymer/sinonjs/sinon.js"></script>

<test-fixture id="basicFixture">
  <template>
    <gr-image-diff-tool>
    </gr-image-diff-tool>
  </template>
</test-fixture>

<script>
  suite('gr-image-diff-tool tests', () => {
    let element;
    let sandbox;

    setup(() => {
      sandbox = sinon.sandbox.create();
      element = fixture('basicFixture');
      flushAsynchronousOperations();
    });

    teardown(() => { sandbox.restore(); });

    test('test opacity mode', () => {
      element._observeMode = 'opacity';
      assert.isTrue(element._showOpacityMode);
      assert.isFalse(element._showResembleMode);
      flushAsynchronousOperations();

      assert.ok(element.$$('gr-opacity-diff-mode'));
      assert.equal(element.$$('gr-resemble-diff-mode'), null);
    });

    test('test resemble mode', () => {
      element._observeMode = 'resemble';
      assert.isTrue(element._showResembleMode);
      assert.isFalse(element._showOpacityMode);
      flushAsynchronousOperations();

      assert.ok(element.$$('gr-resemble-diff-mode'));
      assert.equal(element.$$('gr-opacity-diff-mode'), null);
    });

    test('localStorage persists', () => {
      sandbox.stub(element, '_setMode');
      sandbox.stub(element, '_getMode');
      element.attached();
      assert.equal(element._getMode.callCount, 1);
      assert.equal(element._setMode.callCount, 1);
      element._observeMode = 'opacity';
      assert.equal(element._setMode.callCount, 2);
      element._observeMode = 'resemble';
      assert.equal(element._setMode.callCount, 3);
    });
  });
</script>