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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</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"/>

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

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

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

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

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

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

    test('reload() cancels before network resolves', () => {
      const cancelStub = sandbox.stub(element.$.diff, 'cancel');

      // Stub the network calls into requests that never resolve.
      sandbox.stub(element, '_getDiff', () => new Promise(() => {}));

      element.reload();
      assert.isTrue(cancelStub.called);
    });

    suite('not logged in', () => {
      setup(() => {
        const getLoggedInPromise = Promise.resolve(false);
        stub('gr-rest-api-interface', {
          getLoggedIn() { return getLoggedInPromise; },
        });
        element = fixture('basic');
        return getLoggedInPromise;
      });

      test('reload() loads files weblinks', () => {
        const weblinksStub = sandbox.stub(Gerrit.Nav, '_generateWeblinks')
            .returns({name: 'stubb', url: '#s'});
        sandbox.stub(element.$.restAPI, 'getDiff').returns(Promise.resolve({
          content: [],
        }));
        element.projectName = 'test-project';
        element.path = 'test-path';
        element.commitRange = {baseCommit: 'test-base', commit: 'test-commit'};
        element.patchRange = {};
        return element.reload().then(() => {
          assert.isTrue(weblinksStub.calledTwice);
          assert.isTrue(weblinksStub.firstCall.calledWith({
            commit: 'test-base',
            file: 'test-path',
            options: {
              weblinks: undefined,
            },
            repo: 'test-project',
            type: Gerrit.Nav.WeblinkType.FILE}));
          assert.isTrue(weblinksStub.secondCall.calledWith({
            commit: 'test-commit',
            file: 'test-path',
            options: {
              weblinks: undefined,
            },
            repo: 'test-project',
            type: Gerrit.Nav.WeblinkType.FILE}));
          assert.deepEqual(element.filesWeblinks, {
            meta_a: [{name: 'stubb', url: '#s'}],
            meta_b: [{name: 'stubb', url: '#s'}],
          });
        });
      });

      test('_getDiff handles null diff responses', done => {
        stub('gr-rest-api-interface', {
          getDiff() { return Promise.resolve(null); },
        });
        element.changeNum = 123;
        element.patchRange = {basePatchNum: 1, patchNum: 2};
        element.path = 'file.txt';
        element._getDiff().then(done);
      });

      test('reload resolves on error', () => {
        const onErrStub = sandbox.stub(element, '_handleGetDiffError');
        const error = {ok: false, status: 500};
        sandbox.stub(element.$.restAPI, 'getDiff',
            (changeNum, basePatchNum, patchNum, path, onErr) => {
              onErr(error);
            });
        return element.reload().then(() => {
          assert.isTrue(onErrStub.calledOnce);
        });
      });

      suite('_handleGetDiffError', () => {
        let serverErrorStub;
        let pageErrorStub;

        setup(() => {
          serverErrorStub = sinon.stub();
          element.addEventListener('server-error', serverErrorStub);
          pageErrorStub = sinon.stub();
          element.addEventListener('page-error', pageErrorStub);
        });

        test('page error on HTTP-409', () => {
          element._handleGetDiffError({status: 409});
          assert.isTrue(serverErrorStub.calledOnce);
          assert.isFalse(pageErrorStub.called);
          assert.isNotOk(element._errorMessage);
        });

        test('server error on non-HTTP-409', () => {
          element._handleGetDiffError({status: 500});
          assert.isFalse(serverErrorStub.called);
          assert.isTrue(pageErrorStub.calledOnce);
          assert.isNotOk(element._errorMessage);
        });

        test('error message if showLoadFailure', () => {
          element.showLoadFailure = true;
          element._handleGetDiffError({status: 500, statusText: 'Failure!'});
          assert.isFalse(serverErrorStub.called);
          assert.isFalse(pageErrorStub.called);
          assert.equal(element._errorMessage,
              'Encountered error when loading the diff: 500 Failure!');
        });
      });

      suite('image diffs', () => {
        let mockFile1;
        let mockFile2;
        setup(() => {
          mockFile1 = {
            body: 'Qk06AAAAAAAAADYAAAAoAAAAAQAAAP////8BACAAAAAAAAAAAAATCwAAE' +
            'wsAAAAAAAAAAAAAAAAA/w==',
            type: 'image/bmp',
          };
          mockFile2 = {
            body: 'Qk06AAAAAAAAADYAAAAoAAAAAQAAAP////8BACAAAAAAAAAAAAATCwAAE' +
            'wsAAAAAAAAAAAAA/////w==',
            type: 'image/bmp',
          };
          sandbox.stub(element.$.restAPI,
              'getB64FileContents',
              (changeId, patchNum, path, opt_parentIndex) => {
                return Promise.resolve(opt_parentIndex === 1 ? mockFile1 :
                  mockFile2);
              });

          element.patchRange = {basePatchNum: 'PARENT', patchNum: 1};
          element.comments = {left: [], right: []};
        });

        test('renders image diffs with same file name', done => {
          const mockDiff = {
            meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg', lines: 66},
            meta_b: {name: 'carrot.jpg', content_type: 'image/jpeg',
              lines: 560},
            intraline_status: 'OK',
            change_type: 'MODIFIED',
            diff_header: [
              'diff --git a/carrot.jpg b/carrot.jpg',
              'index 2adc47d..f9c2f2c 100644',
              '--- a/carrot.jpg',
              '+++ b/carrot.jpg',
              'Binary files differ',
            ],
            content: [{skip: 66}],
            binary: true,
          };
          sandbox.stub(element.$.restAPI, 'getDiff')
              .returns(Promise.resolve(mockDiff));

          const rendered = () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diff.$.diffBuilder._builder, GrDiffBuilderImage);

            // Left image rendered with the parent commit's version of the file.
            const leftImage =
                element.$.diff.$.diffTable.querySelector('td.left img');
            const leftLabel =
                element.$.diff.$.diffTable.querySelector('td.left label');
            const leftLabelContent = leftLabel.querySelector('.label');
            const leftLabelName = leftLabel.querySelector('.name');

            const rightImage =
                element.$.diff.$.diffTable.querySelector('td.right img');
            const rightLabel = element.$.diff.$.diffTable.querySelector(
                'td.right label');
            const rightLabelContent = rightLabel.querySelector('.label');
            const rightLabelName = rightLabel.querySelector('.name');

            assert.isNotOk(rightLabelName);
            assert.isNotOk(leftLabelName);

            let leftLoaded = false;
            let rightLoaded = false;

            leftImage.addEventListener('load', () => {
              assert.isOk(leftImage);
              assert.equal(leftImage.getAttribute('src'),
                  'data:image/bmp;base64, ' + mockFile1.body);
              assert.equal(leftLabelContent.textContent, '1×1 image/bmp');
              leftLoaded = true;
              if (rightLoaded) {
                element.removeEventListener('render', rendered);
                done();
              }
            });

            rightImage.addEventListener('load', () => {
              assert.isOk(rightImage);
              assert.equal(rightImage.getAttribute('src'),
                  'data:image/bmp;base64, ' + mockFile2.body);
              assert.equal(rightLabelContent.textContent, '1×1 image/bmp');

              rightLoaded = true;
              if (leftLoaded) {
                element.removeEventListener('render', rendered);
                done();
              }
            });
          };

          element.addEventListener('render', rendered);

          element.$.restAPI.getDiffPreferences().then(prefs => {
            element.prefs = prefs;
            element.reload();
          });
        });

        test('renders image diffs with a different file name', done => {
          const mockDiff = {
            meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg', lines: 66},
            meta_b: {name: 'carrot2.jpg', content_type: 'image/jpeg',
              lines: 560},
            intraline_status: 'OK',
            change_type: 'MODIFIED',
            diff_header: [
              'diff --git a/carrot.jpg b/carrot2.jpg',
              'index 2adc47d..f9c2f2c 100644',
              '--- a/carrot.jpg',
              '+++ b/carrot2.jpg',
              'Binary files differ',
            ],
            content: [{skip: 66}],
            binary: true,
          };
          sandbox.stub(element.$.restAPI, 'getDiff')
              .returns(Promise.resolve(mockDiff));

          const rendered = () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diff.$.diffBuilder._builder, GrDiffBuilderImage);

            // Left image rendered with the parent commit's version of the file.
            const leftImage =
                element.$.diff.$.diffTable.querySelector('td.left img');
            const leftLabel =
                element.$.diff.$.diffTable.querySelector('td.left label');
            const leftLabelContent = leftLabel.querySelector('.label');
            const leftLabelName = leftLabel.querySelector('.name');

            const rightImage =
                element.$.diff.$.diffTable.querySelector('td.right img');
            const rightLabel = element.$.diff.$.diffTable.querySelector(
                'td.right label');
            const rightLabelContent = rightLabel.querySelector('.label');
            const rightLabelName = rightLabel.querySelector('.name');

            assert.isOk(rightLabelName);
            assert.isOk(leftLabelName);
            assert.equal(leftLabelName.textContent, mockDiff.meta_a.name);
            assert.equal(rightLabelName.textContent, mockDiff.meta_b.name);

            let leftLoaded = false;
            let rightLoaded = false;

            leftImage.addEventListener('load', () => {
              assert.isOk(leftImage);
              assert.equal(leftImage.getAttribute('src'),
                  'data:image/bmp;base64, ' + mockFile1.body);
              assert.equal(leftLabelContent.textContent, '1×1 image/bmp');
              leftLoaded = true;
              if (rightLoaded) {
                element.removeEventListener('render', rendered);
                done();
              }
            });

            rightImage.addEventListener('load', () => {
              assert.isOk(rightImage);
              assert.equal(rightImage.getAttribute('src'),
                  'data:image/bmp;base64, ' + mockFile2.body);
              assert.equal(rightLabelContent.textContent, '1×1 image/bmp');

              rightLoaded = true;
              if (leftLoaded) {
                element.removeEventListener('render', rendered);
                done();
              }
            });
          };

          element.addEventListener('render', rendered);

          element.$.restAPI.getDiffPreferences().then(prefs => {
            element.prefs = prefs;
            element.reload();
          });
        });

        test('renders added image', done => {
          const mockDiff = {
            meta_b: {name: 'carrot.jpg', content_type: 'image/jpeg',
              lines: 560},
            intraline_status: 'OK',
            change_type: 'ADDED',
            diff_header: [
              'diff --git a/carrot.jpg b/carrot.jpg',
              'index 0000000..f9c2f2c 100644',
              '--- /dev/null',
              '+++ b/carrot.jpg',
              'Binary files differ',
            ],
            content: [{skip: 66}],
            binary: true,
          };
          sandbox.stub(element.$.restAPI, 'getDiff')
              .returns(Promise.resolve(mockDiff));

          element.addEventListener('render', () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diff.$.diffBuilder._builder, GrDiffBuilderImage);

            const leftImage =
                element.$.diff.$.diffTable.querySelector('td.left img');
            const rightImage =
                element.$.diff.$.diffTable.querySelector('td.right img');

            assert.isNotOk(leftImage);
            assert.isOk(rightImage);
            done();
          });

          element.$.restAPI.getDiffPreferences().then(prefs => {
            element.prefs = prefs;
            element.reload();
          });
        });

        test('renders removed image', done => {
          const mockDiff = {
            meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg',
              lines: 560},
            intraline_status: 'OK',
            change_type: 'DELETED',
            diff_header: [
              'diff --git a/carrot.jpg b/carrot.jpg',
              'index f9c2f2c..0000000 100644',
              '--- a/carrot.jpg',
              '+++ /dev/null',
              'Binary files differ',
            ],
            content: [{skip: 66}],
            binary: true,
          };
          sandbox.stub(element.$.restAPI, 'getDiff')
              .returns(Promise.resolve(mockDiff));

          element.addEventListener('render', () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diff.$.diffBuilder._builder, GrDiffBuilderImage);

            const leftImage =
                element.$.diff.$.diffTable.querySelector('td.left img');
            const rightImage =
                element.$.diff.$.diffTable.querySelector('td.right img');

            assert.isOk(leftImage);
            assert.isNotOk(rightImage);
            done();
          });

          element.$.restAPI.getDiffPreferences().then(prefs => {
            element.prefs = prefs;
            element.reload();
          });
        });

        test('does not render disallowed image type', done => {
          const mockDiff = {
            meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg-evil',
              lines: 560},
            intraline_status: 'OK',
            change_type: 'DELETED',
            diff_header: [
              'diff --git a/carrot.jpg b/carrot.jpg',
              'index f9c2f2c..0000000 100644',
              '--- a/carrot.jpg',
              '+++ /dev/null',
              'Binary files differ',
            ],
            content: [{skip: 66}],
            binary: true,
          };
          mockFile1.type = 'image/jpeg-evil';

          sandbox.stub(element.$.restAPI, 'getDiff')
              .returns(Promise.resolve(mockDiff));

          element.addEventListener('render', () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diff.$.diffBuilder._builder, GrDiffBuilderImage);
            const leftImage =
                element.$.diff.$.diffTable.querySelector('td.left img');
            assert.isNotOk(leftImage);
            done();
          });

          element.$.restAPI.getDiffPreferences().then(prefs => {
            element.prefs = prefs;
            element.reload();
          });
        });
      });
    });

    test('delegates cancel()', () => {
      const stub = sandbox.stub(element.$.diff, 'cancel');
      element.reload();
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('delegates getCursorStops()', () => {
      const returnValue = [document.createElement('b')];
      const stub = sandbox.stub(element.$.diff, 'getCursorStops')
          .returns(returnValue);
      assert.equal(element.getCursorStops(), returnValue);
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('delegates isRangeSelected()', () => {
      const returnValue = true;
      const stub = sandbox.stub(element.$.diff, 'isRangeSelected')
          .returns(returnValue);
      assert.equal(element.isRangeSelected(), returnValue);
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('delegates toggleLeftDiff()', () => {
      const stub = sandbox.stub(element.$.diff, 'toggleLeftDiff');
      element.toggleLeftDiff();
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    suite('blame', () => {
      setup(() => {
        element = fixture('basic');
      });

      test('clearBlame', () => {
        element._blame = [];
        const setBlameSpy = sandbox.spy(element.$.diff.$.diffBuilder, 'setBlame');
        element.clearBlame();
        assert.isNull(element._blame);
        assert.isTrue(setBlameSpy.calledWithExactly(null));
        assert.equal(element.isBlameLoaded, false);
      });

      test('loadBlame', () => {
        const mockBlame = [{id: 'commit id', ranges: [{start: 1, end: 2}]}];
        const showAlertStub = sinon.stub();
        element.addEventListener('show-alert', showAlertStub);
        const getBlameStub = sandbox.stub(element.$.restAPI, 'getBlame')
            .returns(Promise.resolve(mockBlame));
        element.changeNum = 42;
        element.patchRange = {patchNum: 5, basePatchNum: 4};
        element.path = 'foo/bar.baz';
        return element.loadBlame().then(() => {
          assert.isTrue(getBlameStub.calledWithExactly(
              42, 5, 'foo/bar.baz', true));
          assert.isFalse(showAlertStub.called);
          assert.equal(element._blame, mockBlame);
          assert.equal(element.isBlameLoaded, true);
        });
      });

      test('loadBlame empty', () => {
        const mockBlame = [];
        const showAlertStub = sinon.stub();
        element.addEventListener('show-alert', showAlertStub);
        sandbox.stub(element.$.restAPI, 'getBlame')
            .returns(Promise.resolve(mockBlame));
        element.changeNum = 42;
        element.patchRange = {patchNum: 5, basePatchNum: 4};
        element.path = 'foo/bar.baz';
        return element.loadBlame()
            .then(() => {
              assert.isTrue(false, 'Promise should not resolve');
            })
            .catch(() => {
              assert.isTrue(showAlertStub.calledOnce);
              assert.isNull(element._blame);
              assert.equal(element.isBlameLoaded, false);
            });
      });
    });

    test('delegates getThreadEls()', () => {
      const returnValue = [document.createElement('b')];
      const stub = sandbox.stub(element.$.diff, 'getThreadEls')
          .returns(returnValue);
      assert.equal(element.getThreadEls(), returnValue);
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('delegates addDraftAtLine(el)', () => {
      const param0 = document.createElement('b');
      const stub = sandbox.stub(element.$.diff, 'addDraftAtLine');
      element.addDraftAtLine(param0);
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 1);
      assert.equal(stub.lastCall.args[0], param0);
    });

    test('delegates clearDiffContent()', () => {
      const stub = sandbox.stub(element.$.diff, 'clearDiffContent');
      element.clearDiffContent();
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('delegates expandAllContext()', () => {
      const stub = sandbox.stub(element.$.diff, 'expandAllContext');
      element.expandAllContext();
      assert.isTrue(stub.calledOnce);
      assert.equal(stub.lastCall.args.length, 0);
    });

    test('passes in changeNum', () => {
      const value = '12345';
      element.changeNum = value;
      assert.equal(element.$.diff.changeNum, value);
    });

    test('passes in noAutoRender', () => {
      const value = true;
      element.noAutoRender = value;
      assert.equal(element.$.diff.noAutoRender, value);
    });

    test('passes in patchRange', () => {
      const value = {patchNum: 'foo', basePatchNum: 'bar'};
      element.patchRange = value;
      assert.equal(element.$.diff.patchRange, value);
    });

    test('passes in path', () => {
      const value = 'some/file/path';
      element.path = value;
      assert.equal(element.$.diff.path, value);
    });

    test('passes in prefs', () => {
      const value = {};
      element.prefs = value;
      assert.equal(element.$.diff.prefs, value);
    });

    test('passes in projectConfig', () => {
      const value = {};
      element.projectConfig = value;
      assert.equal(element.$.diff.projectConfig, value);
    });

    test('passes in changeNum', () => {
      const value = '12345';
      element.changeNum = value;
      assert.equal(element.$.diff.changeNum, value);
    });

    test('passes in projectName', () => {
      const value = 'Gerrit';
      element.projectName = value;
      assert.equal(element.$.diff.projectName, value);
    });

    test('passes in displayLine', () => {
      const value = true;
      element.displayLine = value;
      assert.equal(element.$.diff.displayLine, value);
    });

    test('passes in commitRange', () => {
      const value = {};
      element.commitRange = value;
      assert.equal(element.$.diff.commitRange, value);
    });

    test('passes in hidden', () => {
      const value = true;
      element.hidden = value;
      assert.equal(element.$.diff.hidden, value);
      assert.isNotNull(element.getAttribute('hidden'));
    });

    test('passes in noRenderOnPrefsChange', () => {
      const value = true;
      element.noRenderOnPrefsChange = value;
      assert.equal(element.$.diff.noRenderOnPrefsChange, value);
    });

    test('passes in comments', () => {
      const value = {left: [], right: []};
      element.comments = value;
      assert.equal(element.$.diff.comments, value);
    });

    test('passes in lineWrapping', () => {
      const value = true;
      element.lineWrapping = value;
      assert.equal(element.$.diff.lineWrapping, value);
    });

    test('passes in viewMode', () => {
      const value = 'SIDE_BY_SIDE';
      element.viewMode = value;
      assert.equal(element.$.diff.viewMode, value);
    });

    test('passes in lineOfInterest', () => {
      const value = {number: 123, leftSide: true};
      element.lineOfInterest = value;
      assert.equal(element.$.diff.lineOfInterest, value);
    });

    suite('_reportDiff', () => {
      let reportStub;

      setup(() => {
        element = fixture('basic');
        element.patchRange = {basePatchNum: 1};
        reportStub = sandbox.stub(element.$.reporting, 'reportInteraction');
      });

      test('null and content-less', () => {
        element._reportDiff(null);
        assert.isFalse(reportStub.called);

        element._reportDiff({});
        assert.isFalse(reportStub.called);
      });

      test('diff w/ no delta', () => {
        const diff = {
          content: [
            {ab: ['foo', 'bar']},
            {ab: ['baz', 'foo']},
          ],
        };
        element._reportDiff(diff);
        assert.isTrue(reportStub.calledOnce);
        assert.equal(reportStub.lastCall.args[0], 'rebase-percent-zero');
        assert.isUndefined(reportStub.lastCall.args[1]);
      });

      test('diff w/ no rebase delta', () => {
        const diff = {
          content: [
            {ab: ['foo', 'bar']},
            {a: ['baz', 'foo']},
            {ab: ['foo', 'bar']},
            {a: ['baz', 'foo'], b: ['bar', 'baz']},
            {ab: ['foo', 'bar']},
            {b: ['baz', 'foo']},
            {ab: ['foo', 'bar']},
          ],
        };
        element._reportDiff(diff);
        assert.isTrue(reportStub.calledOnce);
        assert.equal(reportStub.lastCall.args[0], 'rebase-percent-zero');
        assert.isUndefined(reportStub.lastCall.args[1]);
      });

      test('diff w/ some rebase delta', () => {
        const diff = {
          content: [
            {ab: ['foo', 'bar']},
            {a: ['baz', 'foo'], due_to_rebase: true},
            {ab: ['foo', 'bar']},
            {a: ['baz', 'foo'], b: ['bar', 'baz']},
            {ab: ['foo', 'bar']},
            {b: ['baz', 'foo'], due_to_rebase: true},
            {ab: ['foo', 'bar']},
            {a: ['baz', 'foo']},
          ],
        };
        element._reportDiff(diff);
        assert.isTrue(reportStub.calledOnce);
        assert.equal(reportStub.lastCall.args[0], 'rebase-percent-nonzero');
        assert.strictEqual(reportStub.lastCall.args[1], 50);
      });

      test('diff w/ all rebase delta', () => {
        const diff = {content: [{
          a: ['foo', 'bar'],
          b: ['baz', 'foo'],
          due_to_rebase: true,
        }]};
        element._reportDiff(diff);
        assert.isTrue(reportStub.calledOnce);
        assert.equal(reportStub.lastCall.args[0], 'rebase-percent-nonzero');
        assert.strictEqual(reportStub.lastCall.args[1], 100);
      });

      test('diff against parent event', () => {
        element.patchRange.basePatchNum = 'PARENT';
        const diff = {content: [{
          a: ['foo', 'bar'],
          b: ['baz', 'foo'],
        }]};
        element._reportDiff(diff);
        assert.isTrue(reportStub.calledOnce);
        assert.equal(reportStub.lastCall.args[0], 'diff-against-parent');
        assert.isUndefined(reportStub.lastCall.args[1]);
      });
    });

    suite('_translateChunksToIgnore', () => {
      let content;

      setup(() => {
        content = [
          {ab: ['one', 'two']},
          {a: ['three'], b: ['different three']},
          {b: ['four']},
          {ab: ['five', 'six']},
          {a: ['seven']},
          {ab: ['eight', 'nine']},
        ];
      });

      test('does nothing to unmarked diff', () => {
        assert.deepEqual(element._translateChunksToIgnore({content}),
            {content});
      });

      test('merges marked delta chunk', () => {
        content[1].common = true;
        assert.deepEqual(element._translateChunksToIgnore({content}), {
          content: [
            {ab: ['one', 'two', 'different three']},
            {b: ['four']},
            {ab: ['five', 'six']},
            {a: ['seven']},
            {ab: ['eight', 'nine']},
          ],
        });
      });

      test('merges marked addition chunk', () => {
        content[2].common = true;
        assert.deepEqual(element._translateChunksToIgnore({content}), {
          content: [
            {ab: ['one', 'two']},
            {a: ['three'], b: ['different three']},
            {ab: ['four', 'five', 'six']},
            {a: ['seven']},
            {ab: ['eight', 'nine']},
          ],
        });
      });

      test('merges multiple marked delta', () => {
        content[1].common = true;
        content[2].common = true;
        assert.deepEqual(element._translateChunksToIgnore({content}), {
          content: [
            {ab: ['one', 'two', 'different three', 'four', 'five', 'six']},
            {a: ['seven']},
            {ab: ['eight', 'nine']},
          ],
        });
      });

      test('marked deletion chunks are omitted', () => {
        content[4].common = true;
        assert.deepEqual(element._translateChunksToIgnore({content}), {
          content: [
            {ab: ['one', 'two']},
            {a: ['three'], b: ['different three']},
            {b: ['four']},
            {ab: ['five', 'six', 'eight', 'nine']},
          ],
        });
      });

      test('marked deltas can start shared chunks', () => {
        content[0] = {a: ['one'], b: ['two'], common: true};
        assert.deepEqual(element._translateChunksToIgnore({content}), {
          content: [
            {ab: ['two']},
            {a: ['three'], b: ['different three']},
            {b: ['four']},
            {ab: ['five', 'six']},
            {a: ['seven']},
            {ab: ['eight', 'nine']},
          ],
        });
      });
    });
  });
</script>