gr-resemble-diff-mode/gr-resemble-diff-mode_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>resemble-diff-mode</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-resemble-diff-mode.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-resemble-diff-mode>
    </gr-resemble-diff-mode>
  </template>
</test-fixture>

<script>
  suite('gr-resemble-diff-mode tests', () => {
    let element;

    setup(() => {
      element = fixture('basicFixture');
    });

    test('test initialization', () => {
      assert.notEqual(element, null);
      assert.equal(element.baseImage, null);
      assert.equal(element.revisionImage, null);
    });

    test('test getDataUrl', () => {
      element.baseImage = {
        type: 'image/png',
        body: 'SGVsbG8=',
      };
      const desiredOutput = 'data:image/png;base64,SGVsbG8=';
      assert.equal(element.getDataUrl(element.baseImage), desiredOutput);
    });

    test('test resemble mode image diff', () => {
      const img = element.$.imageDiff;
      const expected_result = 'data:image/png;base64,SGVsbG8V29ybGQ==';
      assert.isFalse(img.hasAttribute('src'));
      element.baseImage = {
        type: 'image/png',
        body: 'SGVsbG8=',
      };
      assert.isFalse(img.hasAttribute('src'));
      element.revisionImage = {
        type: 'image/png',
        body: 'V29ybGQ=',
      };
      flushAsynchronousOperations();
      sinon.stub(element, 'compareImages')
          .returns(Promise.resolve(expected_result));
      return element._handleImageDiff(element.baseImage, element.revisionImage)
          .then(() => {
            assert.equal(img.src, expected_result);
          });
    });
  });
</script>