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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-view</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-view.html">

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

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

<test-fixture id="blank">
  <template>
    <div></div>
  </template>
</test-fixture>

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

    const PARENT = 'PARENT';

    setup(() => {
      sandbox = sinon.sandbox.create();

      stub('gr-rest-api-interface', {
        getConfig() { return Promise.resolve({change: {}}); },
        getLoggedIn() { return Promise.resolve(false); },
        getProjectConfig() { return Promise.resolve({}); },
        getDiffChangeDetail() { return Promise.resolve({}); },
        getChangeFiles() { return Promise.resolve({}); },
        saveFileReviewed() { return Promise.resolve(); },
        getDiffComments() { return Promise.resolve({}); },
        getDiffRobotComments() { return Promise.resolve({}); },
        getDiffDrafts() { return Promise.resolve({}); },
        getReviewedFiles() { return Promise.resolve([]); },
      });
      element = fixture('basic');
      return element._loadComments();
    });

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

    test('params change triggers diffViewDisplayed()', () => {
      sandbox.stub(element.$.reporting, 'diffViewDisplayed');
      sandbox.stub(element.$.diff, 'reload').returns(Promise.resolve());
      sandbox.spy(element, '_paramsChanged');
      element.params = {
        view: Gerrit.Nav.View.DIFF,
        changeNum: '42',
        patchNum: '2',
        basePatchNum: '1',
        path: '/COMMIT_MSG',
      };

      return element._paramsChanged.returnValues[0].then(() => {
        assert.isTrue(element.$.reporting.diffViewDisplayed.calledOnce);
      });
    });

    test('toggle left diff with a hotkey', () => {
      const toggleLeftDiffStub = sandbox.stub(element.$.diff, 'toggleLeftDiff');
      MockInteractions.pressAndReleaseKeyOn(element, 65, 'shift', 'a');
      assert.isTrue(toggleLeftDiffStub.calledOnce);
    });

    test('keyboard shortcuts', () => {
      element._changeNum = '42';
      element._patchRange = {
        basePatchNum: PARENT,
        patchNum: '10',
      };
      element._change = {
        _number: 42,
        revisions: {
          a: {_number: 10, commit: {parents: []}},
        },
      };
      element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
      element._path = 'glados.txt';
      element.changeViewState.selectedFileIndex = 1;

      const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
      const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

      MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
      assert(changeNavStub.lastCall.calledWith(element._change),
          'Should navigate to /c/42/');

      MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
      assert(diffNavStub.lastCall.calledWith(element._change, 'wheatley.md',
          '10', PARENT), 'Should navigate to /c/42/10/wheatley.md');
      element._path = 'wheatley.md';
      assert.equal(element.changeViewState.selectedFileIndex, 2);
      assert.isTrue(element._loading);

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(diffNavStub.lastCall.calledWith(element._change, 'glados.txt',
          '10', PARENT), 'Should navigate to /c/42/10/glados.txt');
      element._path = 'glados.txt';
      assert.equal(element.changeViewState.selectedFileIndex, 1);
      assert.isTrue(element._loading);

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(diffNavStub.lastCall.calledWith(element._change, 'chell.go', '10',
          PARENT), 'Should navigate to /c/42/10/chell.go');
      element._path = 'chell.go';
      assert.equal(element.changeViewState.selectedFileIndex, 0);
      assert.isTrue(element._loading);

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(changeNavStub.lastCall.calledWith(element._change),
          'Should navigate to /c/42/');
      assert.equal(element.changeViewState.selectedFileIndex, 0);
      assert.isTrue(element._loading);

      const showPrefsStub =
          sandbox.stub(element.$.diffPreferences.$.prefsOverlay, 'open',
              () => Promise.resolve());

      MockInteractions.pressAndReleaseKeyOn(element, 188, null, ',');
      assert(showPrefsStub.calledOnce);

      let scrollStub = sandbox.stub(element.$.cursor, 'moveToNextChunk');
      MockInteractions.pressAndReleaseKeyOn(element, 78, null, 'n');
      assert(scrollStub.calledOnce);

      scrollStub = sandbox.stub(element.$.cursor, 'moveToPreviousChunk');
      MockInteractions.pressAndReleaseKeyOn(element, 80, null, 'p');
      assert(scrollStub.calledOnce);

      scrollStub = sandbox.stub(element.$.cursor, 'moveToNextCommentThread');
      MockInteractions.pressAndReleaseKeyOn(element, 78, 'shift', 'n');
      assert(scrollStub.calledOnce);

      scrollStub = sandbox.stub(element.$.cursor,
          'moveToPreviousCommentThread');
      MockInteractions.pressAndReleaseKeyOn(element, 80, 'shift', 'p');
      assert(scrollStub.calledOnce);

      const computeContainerClassStub = sandbox.stub(element.$.diff,
          '_computeContainerClass');
      MockInteractions.pressAndReleaseKeyOn(element, 74, null, 'j');
      assert(computeContainerClassStub.lastCall.calledWithExactly(
          false, 'SIDE_BY_SIDE', true));

      MockInteractions.pressAndReleaseKeyOn(element, 27, null, 'esc');
      assert(computeContainerClassStub.lastCall.calledWithExactly(
          false, 'SIDE_BY_SIDE', false));

      sandbox.stub(element, '_setReviewed');
      element.$.reviewed.checked = false;
      MockInteractions.pressAndReleaseKeyOn(element, 82, 'shift', 'r');
      assert.isFalse(element._setReviewed.called);

      MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
      assert.isTrue(element._setReviewed.called);
      assert.equal(element._setReviewed.lastCall.args[0], true);
    });

    test('shift+x shortcut expands all diff context', () => {
      const expandStub = sandbox.stub(element.$.diff, 'expandAllContext');
      MockInteractions.pressAndReleaseKeyOn(element, 88, 'shift', 'x');
      flushAsynchronousOperations();
      assert.isTrue(expandStub.called);
    });

    test('keyboard shortcuts with patch range', () => {
      element._changeNum = '42';
      element._patchRange = {
        basePatchNum: '5',
        patchNum: '10',
      };
      element._change = {
        _number: 42,
        revisions: {
          a: {_number: 10, commit: {parents: []}},
          b: {_number: 5, commit: {parents: []}},
        },
      };
      element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
      element._path = 'glados.txt';

      const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
      const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
      assert.isTrue(changeNavStub.notCalled, 'The `a` keyboard shortcut ' +
          'should only work when the user is logged in.');
      assert.isNull(window.sessionStorage.getItem(
          'changeView.showReplyDialog'));

      element._loggedIn = true;
      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
      assert.isTrue(element.changeViewState.showReplyDialog);

      assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
          '5'), 'Should navigate to /c/42/5..10');

      MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
      assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
          '5'), 'Should navigate to /c/42/5..10');

      MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
      assert.isTrue(element._loading);
      assert(diffNavStub.lastCall.calledWithExactly(element._change,
          'wheatley.md', '10', '5'),
          'Should navigate to /c/42/5..10/wheatley.md');
      element._path = 'wheatley.md';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert.isTrue(element._loading);
      assert(diffNavStub.lastCall.calledWithExactly(element._change,
          'glados.txt', '10', '5'),
          'Should navigate to /c/42/5..10/glados.txt');
      element._path = 'glados.txt';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert.isTrue(element._loading);
      assert(diffNavStub.lastCall.calledWithExactly(element._change, 'chell.go',
          '10', '5'),
          'Should navigate to /c/42/5..10/chell.go');
      element._path = 'chell.go';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert.isTrue(element._loading);
      assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
          '5'),
          'Should navigate to /c/42/5..10');
    });

    test('keyboard shortcuts with old patch number', () => {
      element._changeNum = '42';
      element._patchRange = {
        basePatchNum: PARENT,
        patchNum: '1',
      };
      element._change = {
        _number: 42,
        revisions: {
          a: {_number: 1, commit: {parents: []}},
          b: {_number: 2, commit: {parents: []}},
        },
      };
      element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
      element._path = 'glados.txt';

      const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
      const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
      assert.isTrue(changeNavStub.notCalled, 'The `a` keyboard shortcut ' +
          'should only work when the user is logged in.');
      assert.isNull(window.sessionStorage.getItem(
          'changeView.showReplyDialog'));

      element._loggedIn = true;
      MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
      assert.isTrue(element.changeViewState.showReplyDialog);

      assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
          PARENT), 'Should navigate to /c/42/1');

      MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
      assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
          PARENT), 'Should navigate to /c/42/1');

      MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
      assert(diffNavStub.lastCall.calledWithExactly(element._change,
          'wheatley.md', '1', PARENT),
          'Should navigate to /c/42/1/wheatley.md');
      element._path = 'wheatley.md';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(diffNavStub.lastCall.calledWithExactly(element._change,
          'glados.txt', '1', PARENT),
          'Should navigate to /c/42/1/glados.txt');
      element._path = 'glados.txt';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(diffNavStub.lastCall.calledWithExactly(element._change, 'chell.go',
          '1', PARENT), 'Should navigate to /c/42/1/chell.go');
      element._path = 'chell.go';

      MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
      assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
          PARENT), 'Should navigate to /c/42/1');
    });

    test('Diff preferences hidden when no prefs or logged out', () => {
      element._loggedIn = false;
      flushAsynchronousOperations();
      assert.isTrue(element.$.diffPrefsContainer.hidden);

      element._loggedIn = true;
      flushAsynchronousOperations();
      assert.isTrue(element.$.diffPrefsContainer.hidden);

      element._loggedIn = false;
      element._prefs = {font_size: '12'};
      flushAsynchronousOperations();
      assert.isTrue(element.$.diffPrefsContainer.hidden);

      element._loggedIn = true;
      flushAsynchronousOperations();
      assert.isFalse(element.$.diffPrefsContainer.hidden);
    });

    test('prefsButton opens gr-diff-preferences', () => {
      const handlePrefsTapSpy = sandbox.spy(element, '_handlePrefsTap');
      const overlayOpenStub = sandbox.stub(element.$.diffPreferences,
          'open');
      const prefsButton =
          Polymer.dom(element.root).querySelector('.prefsButton');

      MockInteractions.tap(prefsButton);

      assert.isTrue(handlePrefsTapSpy.called);
      assert.isTrue(overlayOpenStub.called);
    });

    test('_computeCommentString', done => {
      loadCommentSpy = sandbox.spy(element.$.commentAPI, 'loadAll');
      const path = '/test';
      element.$.commentAPI.loadAll().then(comments => {
        const commentCountStub =
            sandbox.stub(comments, 'computeCommentCount');
        const unresolvedCountStub =
            sandbox.stub(comments, 'computeUnresolvedNum');
        commentCountStub.withArgs(1, path).returns(0);
        commentCountStub.withArgs(2, path).returns(1);
        commentCountStub.withArgs(3, path).returns(2);
        commentCountStub.withArgs(4, path).returns(0);
        unresolvedCountStub.withArgs(1, path).returns(1);
        unresolvedCountStub.withArgs(2, path).returns(0);
        unresolvedCountStub.withArgs(3, path).returns(2);
        unresolvedCountStub.withArgs(4, path).returns(0);

        assert.equal(element._computeCommentString(comments, 1, path),
            '1 unresolved');
        assert.equal(element._computeCommentString(comments, 2, path),
            '1 comment');
        assert.equal(element._computeCommentString(comments, 3, path),
            '2 comments, 2 unresolved');
        assert.equal(element._computeCommentString(comments, 4, path), '');
        done();
      });
    });

    suite('url params', () => {
      setup(() => {
        sandbox.stub(Gerrit.Nav, 'getUrlForDiff', (c, p, pn, bpn) => {
          return `${c._number}-${p}-${pn}-${bpn}`;
        });
        sandbox.stub(Gerrit.Nav, 'getUrlForChange', (c, pn, bpn) => {
          return `${c._number}-${pn}-${bpn}`;
        });
      });

      test('_formattedFiles', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: PARENT,
          patchNum: '10',
        };
        element._change = {_number: 42};
        element._fileList = ['chell.go', 'glados.txt', 'wheatley.md',
          '/COMMIT_MSG', '/MERGE_LIST'];
        element._path = 'glados.txt';
        const expectedFormattedFiles = [
          {
            text: 'chell.go',
            mobileText: 'chell.go',
            value: 'chell.go',
            bottomText: '',
          }, {
            text: 'glados.txt',
            mobileText: 'glados.txt',
            value: 'glados.txt',
            bottomText: '',
          }, {
            text: 'wheatley.md',
            mobileText: 'wheatley.md',
            value: 'wheatley.md',
            bottomText: '',
          },
          {
            text: 'Commit message',
            mobileText: 'Commit message',
            value: '/COMMIT_MSG',
            bottomText: '',
          },
          {
            text: 'Merge list',
            mobileText: 'Merge list',
            value: '/MERGE_LIST',
            bottomText: '',
          },
        ];

        assert.deepEqual(element._formattedFiles, expectedFormattedFiles);
        assert.equal(element._formattedFiles[1].value, element._path);
      });

      test('prev/up/next links', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: PARENT,
          patchNum: '10',
        };
        element._change = {
          _number: 42,
          revisions: {
            a: {_number: 10, commit: {parents: []}},
          },
        };
        element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
        element._path = 'glados.txt';
        flushAsynchronousOperations();
        const linkEls = Polymer.dom(element.root).querySelectorAll('.navLink');
        assert.equal(linkEls.length, 3);
        assert.equal(linkEls[0].getAttribute('href'), '42-chell.go-10-PARENT');
        assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
        assert.equal(linkEls[2].getAttribute('href'),
            '42-wheatley.md-10-PARENT');
        element._path = 'wheatley.md';
        flushAsynchronousOperations();
        assert.equal(linkEls[0].getAttribute('href'),
            '42-glados.txt-10-PARENT');
        assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
        assert.isFalse(linkEls[2].hasAttribute('href'));
        element._path = 'chell.go';
        flushAsynchronousOperations();
        assert.isFalse(linkEls[0].hasAttribute('href'));
        assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
        assert.equal(linkEls[2].getAttribute('href'),
            '42-glados.txt-10-PARENT');
        element._path = 'not_a_real_file';
        flushAsynchronousOperations();
        assert.equal(linkEls[0].getAttribute('href'),
            '42-wheatley.md-10-PARENT');
        assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
        assert.equal(linkEls[2].getAttribute('href'), '42-chell.go-10-PARENT');
      });

      test('prev/up/next links with patch range', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: '5',
          patchNum: '10',
        };
        element._change = {
          _number: 42,
          revisions: {
            a: {_number: 5, commit: {parents: []}},
            b: {_number: 10, commit: {parents: []}},
          },
        };
        element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
        element._path = 'glados.txt';
        flushAsynchronousOperations();
        const linkEls = Polymer.dom(element.root).querySelectorAll('.navLink');
        assert.equal(linkEls.length, 3);
        assert.equal(linkEls[0].getAttribute('href'), '42-chell.go-10-5');
        assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
        assert.equal(linkEls[2].getAttribute('href'), '42-wheatley.md-10-5');
        element._path = 'wheatley.md';
        flushAsynchronousOperations();
        assert.equal(linkEls[0].getAttribute('href'), '42-glados.txt-10-5');
        assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
        assert.isFalse(linkEls[2].hasAttribute('href'));
        element._path = 'chell.go';
        flushAsynchronousOperations();
        assert.isFalse(linkEls[0].hasAttribute('href'));
        assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
        assert.equal(linkEls[2].getAttribute('href'), '42-glados.txt-10-5');
      });
    });

    test('_handlePatchChange calls navigateToDiff correctly', () => {
      const navigateStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
      element._change = {_number: 321, project: 'foo/bar'};
      element._path = 'path/to/file.txt';

      element._patchRange = {
        basePatchNum: 'PARENT',
        patchNum: '3',
      };

      const detail = {
        basePatchNum: 'PARENT',
        patchNum: '1',
      };

      element.$.rangeSelect.dispatchEvent(
          new CustomEvent('patch-range-change', {detail, bubbles: false}));

      assert(navigateStub.lastCall.calledWithExactly(element._change,
          element._path, '1', 'PARENT'));
    });

    test('download link', () => {
      element._changeNum = '42';
      element._patchRange = {
        basePatchNum: PARENT,
        patchNum: '10',
      };
      element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
      element._path = 'glados.txt';
      flushAsynchronousOperations();
      const link = element.$$('.downloadLink');
      assert.equal(link.getAttribute('href'),
          '/changes/42/revisions/10/patch?zip&path=glados.txt');
      assert.isTrue(link.hasAttribute('download'));
    });

    test('_prefs.manual_review is respected', () => {
      const saveReviewedStub = sandbox.stub(element, '_saveReviewedState',
          () => Promise.resolve());
      const getReviewedStub = sandbox.stub(element, '_getReviewedStatus',
          () => Promise.resolve());

      sandbox.stub(element.$.diff, 'reload');
      element._loggedIn = true;
      element.params = {
        view: Gerrit.Nav.View.DIFF,
        changeNum: '42',
        patchNum: '2',
        basePatchNum: '1',
        path: '/COMMIT_MSG',
      };
      element._prefs = {manual_review: true};
      flushAsynchronousOperations();

      assert.isFalse(saveReviewedStub.called);
      assert.isTrue(getReviewedStub.called);

      element._prefs = {};
      flushAsynchronousOperations();

      assert.isTrue(saveReviewedStub.called);
      assert.isTrue(getReviewedStub.calledOnce);
    });

    test('file review status', () => {
      const saveReviewedStub = sandbox.stub(element, '_saveReviewedState',
          () => Promise.resolve());
      sandbox.stub(element.$.diff, 'reload');

      element._loggedIn = true;
      element.params = {
        view: Gerrit.Nav.View.DIFF,
        changeNum: '42',
        patchNum: '2',
        basePatchNum: '1',
        path: '/COMMIT_MSG',
      };
      element._prefs = {};
      flushAsynchronousOperations();

      const commitMsg = Polymer.dom(element.root).querySelector(
          'input[type="checkbox"]');

      assert.isTrue(commitMsg.checked);
      MockInteractions.tap(commitMsg);
      assert.isFalse(commitMsg.checked);
      assert.isTrue(saveReviewedStub.lastCall.calledWithExactly(false));

      MockInteractions.tap(commitMsg);
      assert.isTrue(commitMsg.checked);
      assert.isTrue(saveReviewedStub.lastCall.calledWithExactly(true));
      const callCount = saveReviewedStub.callCount;

      element.set('params.view', Gerrit.Nav.View.CHANGE);
      flushAsynchronousOperations();

      // saveReviewedState observer observes params, but should not fire when
      // view !== Gerrit.Nav.View.DIFF.
      assert.equal(saveReviewedStub.callCount, callCount);
    });

    test('file review status with edit loaded', () => {
      const saveReviewedStub = sandbox.stub(element, '_saveReviewedState');

      element._patchRange = {patchNum: element.EDIT_NAME};
      flushAsynchronousOperations();

      assert.isTrue(element._editMode);
      element._setReviewed();
      assert.isFalse(saveReviewedStub.called);
    });

    test('hash is determined from params', done => {
      sandbox.stub(element.$.diff, 'reload');
      sandbox.stub(element, '_initCursor');

      element._loggedIn = true;
      element.params = {
        view: Gerrit.Nav.View.DIFF,
        changeNum: '42',
        patchNum: '2',
        basePatchNum: '1',
        path: '/COMMIT_MSG',
        hash: 10,
      };

      flush(() => {
        assert.isTrue(element._initCursor.calledOnce);
        done();
      });
    });

    test('diff mode selector correctly toggles the diff', () => {
      const select = element.$.modeSelect;
      const diffDisplay = element.$.diff;
      element._userPrefs = {default_diff_view: 'SIDE_BY_SIDE'};

      // The mode selected in the view state reflects the selected option.
      assert.equal(element._getDiffViewMode(), select.mode);

      // The mode selected in the view state reflects the view rednered in the
      // diff.
      assert.equal(select.mode, diffDisplay.viewMode);

      // We will simulate a user change of the selected mode.
      const newMode = 'UNIFIED_DIFF';

      // Set the mode, and simulate the change event.
      element.set('changeViewState.diffMode', newMode);

      // Make sure the handler was called and the state is still coherent.
      assert.equal(element._getDiffViewMode(), newMode);
      assert.equal(element._getDiffViewMode(), select.mode);
      assert.equal(element._getDiffViewMode(), diffDisplay.viewMode);
    });

    test('diff mode selector initializes from preferences', () => {
      let resolvePrefs;
      const prefsPromise = new Promise(resolve => {
        resolvePrefs = resolve;
      });
      sandbox.stub(element.$.restAPI, 'getPreferences', () => prefsPromise);

      // Attach a new gr-diff-view so we can intercept the preferences fetch.
      const view = document.createElement('gr-diff-view');
      fixture('blank').appendChild(view);
      flushAsynchronousOperations();

      // At this point the diff mode doesn't yet have the user's preference.
      assert.equal(view._getDiffViewMode(), 'SIDE_BY_SIDE');

      // Receive the overriding preference.
      resolvePrefs({default_diff_view: 'UNIFIED'});
      flushAsynchronousOperations();
      assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
    });

    suite('_commitRange', () => {
      setup(() => {
        sandbox.stub(element.$.diff, 'reload');
        sandbox.stub(element, '_initCursor');
        sandbox.stub(element, '_getChangeDetail').returns(Promise.resolve({
          _number: 42,
          revisions: {
            'commit-sha-1': {
              _number: 1,
              commit: {
                parents: [{commit: 'sha-1-parent'}],
              },
            },
            'commit-sha-2': {_number: 2},
            'commit-sha-3': {_number: 3},
            'commit-sha-4': {_number: 4},
            'commit-sha-5': {
              _number: 5,
              commit: {
                parents: [{commit: 'sha-5-parent'}],
              },
            },
          },
        }));
      });

      test('uses the patchNum and basePatchNum ', done => {
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '4',
          basePatchNum: '2',
          path: '/COMMIT_MSG',
        };
        flush(() => {
          assert.deepEqual(element._commitRange, {
            baseCommit: 'commit-sha-2',
            commit: 'commit-sha-4',
          });
          done();
        });
      });

      test('uses the parent when there is no base patch num ', done => {
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '5',
          path: '/COMMIT_MSG',
        };
        flush(() => {
          assert.deepEqual(element._commitRange, {
            commit: 'commit-sha-5',
            baseCommit: 'sha-5-parent',
          });
          done();
        });
      });
    });

    test('_initCursor', () => {
      assert.isNotOk(element.$.cursor.initialLineNumber);

      // Does nothing when params specify no cursor address:
      element._initCursor({});
      assert.isNotOk(element.$.cursor.initialLineNumber);

      // Does nothing when params specify side but no number:
      element._initCursor({leftSide: true});
      assert.isNotOk(element.$.cursor.initialLineNumber);

      // Revision hash: specifies lineNum but not side.
      element._initCursor({lineNum: 234});
      assert.equal(element.$.cursor.initialLineNumber, 234);
      assert.equal(element.$.cursor.side, 'right');

      // Base hash: specifies lineNum and side.
      element._initCursor({leftSide: true, lineNum: 345});
      assert.equal(element.$.cursor.initialLineNumber, 345);
      assert.equal(element.$.cursor.side, 'left');

      // Specifies right side:
      element._initCursor({leftSide: false, lineNum: 123});
      assert.equal(element.$.cursor.initialLineNumber, 123);
      assert.equal(element.$.cursor.side, 'right');
    });

    test('_getLineOfInterest', () => {
      assert.isNull(element._getLineOfInterest({}));

      let result = element._getLineOfInterest({lineNum: 12});
      assert.equal(result.number, 12);
      assert.isNotOk(result.leftSide);

      result = element._getLineOfInterest({lineNum: 12, leftSide: true});
      assert.equal(result.number, 12);
      assert.isOk(result.leftSide);
    });

    test('_onLineSelected', () => {
      const getUrlStub = sandbox.stub(Gerrit.Nav, 'getUrlForDiffById');
      const replaceStateStub = sandbox.stub(history, 'replaceState');
      const moveStub = sandbox.stub(element.$.cursor, 'moveToLineNumber');
      sandbox.stub(element.$.cursor, 'getAddress')
          .returns({number: 123, isLeftSide: false});

      element._changeNum = 321;
      element._change = {_number: 321, project: 'foo/bar'};
      element._patchRange = {
        basePatchNum: '3',
        patchNum: '5',
      };
      const e = {};
      const detail = {number: 123, side: 'right'};

      element._onLineSelected(e, detail);

      assert.isTrue(moveStub.called);
      assert.equal(moveStub.lastCall.args[0], detail.number);
      assert.equal(moveStub.lastCall.args[1], detail.side);

      assert.isTrue(replaceStateStub.called);
      assert.isTrue(getUrlStub.called);
    });

    test('_onLineSelected w/o line address', () => {
      const getUrlStub = sandbox.stub(Gerrit.Nav, 'getUrlForDiffById');
      sandbox.stub(history, 'replaceState');
      sandbox.stub(element.$.cursor, 'moveToLineNumber');
      sandbox.stub(element.$.cursor, 'getAddress').returns(null);
      element._changeNum = 321;
      element._change = {_number: 321, project: 'foo/bar'};
      element._patchRange = {basePatchNum: '3', patchNum: '5'};
      element._onLineSelected({}, {number: 123, side: 'right'});
      assert.isTrue(getUrlStub.calledOnce);
      assert.isUndefined(getUrlStub.lastCall.args[5]);
      assert.isUndefined(getUrlStub.lastCall.args[6]);
    });

    test('_getDiffViewMode', () => {
      // No user prefs or change view state set.
      assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');

      // User prefs but no change view state set.
      element._userPrefs = {default_diff_view: 'UNIFIED_DIFF'};
      assert.equal(element._getDiffViewMode(), 'UNIFIED_DIFF');

      // User prefs and change view state set.
      element.changeViewState = {diffMode: 'SIDE_BY_SIDE'};
      assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
    });

    test('_handleMKey', () => {
      sandbox.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
      const e = {preventDefault: () => {}};
      // Initial state.
      assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');

      element._handleMKey(e);
      assert.equal(element._getDiffViewMode(), 'UNIFIED_DIFF');

      element._handleMKey(e);
      assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
    });

    suite('_loadComments', () => {
      test('empty', done => {
        element._loadComments().then(() => {
          assert.equal(Object.keys(element._commentMap).length, 0);
          done();
        });
      });

      test('has paths', done => {
        sandbox.stub(element, '_getPaths').returns({
          'path/to/file/one.cpp': [{patch_set: 3, message: 'lorem'}],
          'path-to/file/two.py': [{patch_set: 5, message: 'ipsum'}],
        });
        sandbox.stub(element, '_getCommentsForPath').returns({meta: {}});
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: '3',
          patchNum: '5',
        };
        element._loadComments().then(() => {
          assert.deepEqual(Object.keys(element._commentMap),
              ['path/to/file/one.cpp', 'path-to/file/two.py']);
          done();
        });
      });
    });

    suite('_computeCommentSkips', () => {
      test('empty file list', () => {
        const commentMap = {
          'path/one.jpg': true,
          'path/three.wav': true,
        };
        const path = 'path/two.m4v';
        const fileList = [];
        const result = element._computeCommentSkips(commentMap, fileList, path);
        assert.isNull(result.previous);
        assert.isNull(result.next);
      });

      test('finds skips', () => {
        const fileList = ['path/one.jpg', 'path/two.m4v', 'path/three.wav'];
        let path = fileList[1];
        const commentMap = {};
        commentMap[fileList[0]] = true;
        commentMap[fileList[1]] = false;
        commentMap[fileList[2]] = true;

        let result = element._computeCommentSkips(commentMap, fileList, path);
        assert.equal(result.previous, fileList[0]);
        assert.equal(result.next, fileList[2]);

        commentMap[fileList[1]] = true;

        result = element._computeCommentSkips(commentMap, fileList, path);
        assert.equal(result.previous, fileList[0]);
        assert.equal(result.next, fileList[2]);

        path = fileList[0];

        result = element._computeCommentSkips(commentMap, fileList, path);
        assert.isNull(result.previous);
        assert.equal(result.next, fileList[1]);

        path = fileList[2];

        result = element._computeCommentSkips(commentMap, fileList, path);
        assert.equal(result.previous, fileList[1]);
        assert.isNull(result.next);
      });

      suite('skip next/previous', () => {
        let navToChangeStub;
        let navToDiffStub;

        setup(() => {
          navToChangeStub = sandbox.stub(element, '_navToChangeView');
          navToDiffStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
          element._fileList = [
            'path/one.jpg', 'path/two.m4v', 'path/three.wav',
          ];
          element._patchRange = {patchNum: '2', basePatchNum: '1'};
        });

        suite('_moveToPreviousFileWithComment', () => {
          test('no skips', () => {
            element._moveToPreviousFileWithComment();
            assert.isFalse(navToChangeStub.called);
            assert.isFalse(navToDiffStub.called);
          });

          test('no previous', () => {
            const commentMap = {};
            commentMap[element._fileList[0]] = false;
            commentMap[element._fileList[1]] = false;
            commentMap[element._fileList[2]] = true;
            element._commentMap = commentMap;
            element._path = element._fileList[1];

            element._moveToPreviousFileWithComment();
            assert.isTrue(navToChangeStub.calledOnce);
            assert.isFalse(navToDiffStub.called);
          });

          test('w/ previous', () => {
            const commentMap = {};
            commentMap[element._fileList[0]] = true;
            commentMap[element._fileList[1]] = false;
            commentMap[element._fileList[2]] = true;
            element._commentMap = commentMap;
            element._path = element._fileList[1];

            element._moveToPreviousFileWithComment();
            assert.isFalse(navToChangeStub.called);
            assert.isTrue(navToDiffStub.calledOnce);
          });
        });

        suite('_moveToNextFileWithComment', () => {
          test('no skips', () => {
            element._moveToNextFileWithComment();
            assert.isFalse(navToChangeStub.called);
            assert.isFalse(navToDiffStub.called);
          });

          test('no previous', () => {
            const commentMap = {};
            commentMap[element._fileList[0]] = true;
            commentMap[element._fileList[1]] = false;
            commentMap[element._fileList[2]] = false;
            element._commentMap = commentMap;
            element._path = element._fileList[1];

            element._moveToNextFileWithComment();
            assert.isTrue(navToChangeStub.calledOnce);
            assert.isFalse(navToDiffStub.called);
          });

          test('w/ previous', () => {
            const commentMap = {};
            commentMap[element._fileList[0]] = true;
            commentMap[element._fileList[1]] = false;
            commentMap[element._fileList[2]] = true;
            element._commentMap = commentMap;
            element._path = element._fileList[1];

            element._moveToNextFileWithComment();
            assert.isFalse(navToChangeStub.called);
            assert.isTrue(navToDiffStub.calledOnce);
          });
        });
      });
    });

    test('_computeEditMode', () => {
      const callCompute = range => element._computeEditMode({base: range});
      assert.isFalse(callCompute({}));
      assert.isFalse(callCompute({basePatchNum: 'PARENT', patchNum: 1}));
      assert.isFalse(callCompute({basePatchNum: 'edit', patchNum: 1}));
      assert.isTrue(callCompute({basePatchNum: 1, patchNum: 'edit'}));
    });

    test('_computeFileNum', () => {
      assert.equal(element._computeFileNum('/foo',
          [{value: '/foo'}, {value: '/bar'}]), 1);
      assert.equal(element._computeFileNum('/bar',
          [{value: '/foo'}, {value: '/bar'}]), 2);
    });

    test('_computeFileNumClass', () => {
      assert.equal(element._computeFileNumClass(0, []), '');
      assert.equal(element._computeFileNumClass(1,
          [{value: '/foo'}, {value: '/bar'}]), 'show');
    });

    test('_getReviewedStatus', () => {
      const promises = [];
      element.$.restAPI.getReviewedFiles.restore();

      sandbox.stub(element.$.restAPI, 'getReviewedFiles')
          .returns(Promise.resolve(['path']));

      promises.push(element._getReviewedStatus(true, null, null, 'path')
          .then(reviewed => assert.isFalse(reviewed)));

      promises.push(element._getReviewedStatus(false, null, null, 'otherPath')
          .then(reviewed => assert.isFalse(reviewed)));

      promises.push(element._getReviewedStatus(false, null, null, 'path')
          .then(reviewed => assert.isTrue(reviewed)));

      return Promise.all(promises);
    });

    suite('editMode behavior', () => {
      setup(() => {
        element._loggedIn = true;
      });

      const isVisible = el => {
        assert.ok(el);
        return getComputedStyle(el).getPropertyValue('display') !== 'none';
      };

      test('reviewed checkbox', () => {
        sandbox.stub(element, '_handlePatchChange');
        element._patchRange = {patchNum: '1'};
        // Reviewed checkbox should be shown.
        assert.isTrue(isVisible(element.$.reviewed));
        element.set('_patchRange.patchNum', element.EDIT_NAME);
        flushAsynchronousOperations();

        assert.isFalse(isVisible(element.$.reviewed));
      });
    });

    test('_paramsChanged sets in projectLookup', () => {
      sandbox.stub(element, '_getLineOfInterest');
      sandbox.stub(element, '_initCursor');
      const setStub = sandbox.stub(element.$.restAPI, 'setInProjectLookup');
      element._paramsChanged({
        view: Gerrit.Nav.View.DIFF,
        changeNum: 101,
        project: 'test-project',
        path: '',
      });
      assert.isTrue(setStub.calledOnce);
      assert.isTrue(setStub.calledWith(101, 'test-project'));
    });
  });
</script>