polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector_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>gr-diff-mode-selector</title>

<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<script src="../../../bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<script src="../../../bower_components/page/page.js"></script>
<script src="../../../scripts/util.js"></script>

<link rel="import" href="gr-diff-mode-selector.html">

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

<test-fixture id="basic">
  <template>
    <gr-diff-mode-selector></gr-diff-mode-selector>
  </template>
</test-fixture>

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

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

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

    test('_computeSelectedClass', () => {
      assert.equal(
          element._computeSelectedClass('SIDE_BY_SIDE', 'SIDE_BY_SIDE'),
          'selected');
      assert.equal(
          element._computeSelectedClass('SIDE_BY_SIDE', 'UNIFIED_DIFF'), '');
    });

    test('setMode', () => {
      const saveStub = sandbox.stub(element.$.restAPI, 'savePreferences');

      // Setting the mode initially does not save prefs.
      element.saveOnChange = true;
      element.setMode('SIDE_BY_SIDE');
      assert.isFalse(saveStub.called);

      // Setting the mode to itself does not save prefs.
      element.setMode('SIDE_BY_SIDE');
      assert.isFalse(saveStub.called);

      // Setting the mode to something else does not save prefs if saveOnChange
      // is false.
      element.saveOnChange = false;
      element.setMode('UNIFIED_DIFF');
      assert.isFalse(saveStub.called);

      // Setting the mode to something else does not save prefs if saveOnChange
      // is false.
      element.saveOnChange = true;
      element.setMode('SIDE_BY_SIDE');
      assert.isTrue(saveStub.calledOnce);
    });
  });
</script>