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">
<meta charset="utf-8">
<title>image-diff-tool</title>
<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>
<script src="../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script src="../bower_components/web-component-tester/browser.js"></script>
<script src="../node_modules/resemblejs/resemble.js"></script>

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

<script type="module">
  import '../test/common-test-setup.js';
  import "./gr-image-diff-tool.js";
  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.shadowRoot.querySelector('gr-opacity-diff-mode'));
      assert.equal(element.shadowRoot.querySelector('gr-resemble-diff-mode'), null);
    });

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

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

    test('localStorage persists', () => {
      sandbox.stub(element, '_setMode');
      sandbox.stub(element, '_getMode');
      element.connectedCallback();
      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>