text: /**
   * @license
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import '../../../test/common-test-setup-karma.js';
  import './gr-diff-mode-selector.js';
  import {DiffViewMode} from '../../../constants/constants.js';
  import {stubRestApi} from '../../../test/test-utils.js';
  
  const basicFixture = fixtureFromElement('gr-diff-mode-selector');
  
  suite('gr-diff-mode-selector tests', () => {
    let element;
  
    setup(() => {
      element = basicFixture.instantiate();
    });
  
    test('_computeSelectedClass', () => {
      assert.equal(element._computeSideBySideSelected(DiffViewMode.SIDE_BY_SIDE),
          'selected');
      assert.equal(element._computeSideBySideSelected(DiffViewMode.UNIFIED),
          '');
      assert.equal(element._computeUnifiedSelected(DiffViewMode.UNIFIED),
          'selected');
      assert.equal(element._computeUnifiedSelected(DiffViewMode.SIDE_BY_SIDE),
          '');
    });
  
    test('setMode', () => {
      const saveStub = stubRestApi('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);
    });
  });
  
  