<!DOCTYPE html>
<!--
@license
Copyright (C) 2015 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.
-->

<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"/>
<script src="../../../scripts/util.js"></script>

<link rel="import" href="../../shared/gr-rest-api-interface/mock-diff-response_test.html">
<link rel="import" href="gr-diff.html">

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

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

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

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

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

    test('cancel', () => {
      element = fixture('basic');
      const cancelStub = sandbox.stub(element.$.diffBuilder, 'cancel');
      element.cancel();
      assert.isTrue(cancelStub.calledOnce);
    });

    test('line limit with line_wrapping', () => {
      element = fixture('basic');
      element.prefs = {line_wrapping: true, line_length: 80, tab_size: 2};
      flushAsynchronousOperations();
      assert.equal(element.customStyle['--line-limit'], '80ch');
    });

    test('line limit without line_wrapping', () => {
      element = fixture('basic');
      element.prefs = {line_wrapping: false, line_length: 80, tab_size: 2};
      flushAsynchronousOperations();
      assert.isNotOk(element.customStyle['--line-limit']);
    });

    suite('_get{PatchNum|IsParentComment}ByLineAndContent', () => {
      let lineEl;
      let contentEl;

      setup(() => {
        element = fixture('basic');
        lineEl = document.createElement('td');
        contentEl = document.createElement('span');
      });

      suite('_getPatchNumByLineAndContent', () => {
        test('right side', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          lineEl.classList.add('right');
          assert.equal(element._getPatchNumByLineAndContent(lineEl, contentEl),
              4);
        });

        test('left side parent by linenum', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          lineEl.classList.add('left');
          assert.equal(element._getPatchNumByLineAndContent(lineEl, contentEl),
              4);
        });

        test('left side parent by content', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          contentEl.classList.add('remove');
          assert.equal(element._getPatchNumByLineAndContent(lineEl, contentEl),
              4);
        });

        test('left side merge parent', () => {
          element.patchRange = {patchNum: 4, basePatchNum: -2};
          contentEl.classList.add('remove');
          assert.equal(element._getPatchNumByLineAndContent(lineEl, contentEl),
              4);
        });

        test('left side non parent', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 3};
          contentEl.classList.add('remove');
          assert.equal(element._getPatchNumByLineAndContent(lineEl, contentEl),
              3);
        });
      });

      suite('_getIsParentCommentByLineAndContent', () => {
        test('right side', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          lineEl.classList.add('right');
          assert.isFalse(
              element._getIsParentCommentByLineAndContent(lineEl, contentEl));
        });

        test('left side parent by linenum', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          lineEl.classList.add('left');
          assert.isTrue(
              element._getIsParentCommentByLineAndContent(lineEl, contentEl));
        });

        test('left side parent by content', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 'PARENT'};
          contentEl.classList.add('remove');
          assert.isTrue(
              element._getIsParentCommentByLineAndContent(lineEl, contentEl));
        });

        test('left side merge parent', () => {
          element.patchRange = {patchNum: 4, basePatchNum: -2};
          contentEl.classList.add('remove');
          assert.isTrue(
              element._getIsParentCommentByLineAndContent(lineEl, contentEl));
        });

        test('left side non parent', () => {
          element.patchRange = {patchNum: 4, basePatchNum: 3};
          contentEl.classList.add('remove');
          assert.isFalse(
              element._getIsParentCommentByLineAndContent(lineEl, contentEl));
        });
      });
    });

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

      test('toggleLeftDiff', () => {
        element.toggleLeftDiff();
        assert.isTrue(element.classList.contains('no-left'));
        element.toggleLeftDiff();
        assert.isFalse(element.classList.contains('no-left'));
      });

      test('addDraftAtLine', () => {
        sandbox.stub(element, '_selectLine');
        const loggedInErrorSpy = sandbox.spy();
        element.addEventListener('show-auth-required', loggedInErrorSpy);
        element.addDraftAtLine();
        assert.isTrue(loggedInErrorSpy.called);
      });

      test('view does not start with displayLine classList', () => {
        assert.isFalse(
            element.$$('.diffContainer').classList.contains('displayLine'));
      });

      test('displayLine class added called when displayLine is true', () => {
        const spy = sandbox.spy(element, '_computeContainerClass');
        element.displayLine = true;
        assert.isTrue(spy.called);
        assert.isTrue(
            element.$$('.diffContainer').classList.contains('displayLine'));
      });

      test('remove comment', () => {
        element.comments = {
          meta: {
            changeNum: '42',
            patchRange: {
              basePatchNum: 'PARENT',
              patchNum: 3,
            },
            path: '/path/to/foo',
            projectConfig: {foo: 'bar'},
          },
          left: [
            {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
            {id: 'bc2', side: 'PARENT', __commentSide: 'left'},
            {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
            {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
          ],
          right: [
            {id: 'c1', __commentSide: 'right'},
            {id: 'c2', __commentSide: 'right'},
            {id: 'd1', __draft: true, __commentSide: 'right'},
            {id: 'd2', __draft: true, __commentSide: 'right'},
          ],
        };

        element._removeComment({});
        // Using JSON.stringify because Safari 9.1 (11601.5.17.1) doesn’t seem
        // to believe that one object deepEquals another even when they do :-/.
        assert.equal(JSON.stringify(element.comments), JSON.stringify({
          meta: {
            changeNum: '42',
            patchRange: {
              basePatchNum: 'PARENT',
              patchNum: 3,
            },
            path: '/path/to/foo',
            projectConfig: {foo: 'bar'},
          },
          left: [
            {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
            {id: 'bc2', side: 'PARENT', __commentSide: 'left'},
            {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
            {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
          ],
          right: [
            {id: 'c1', __commentSide: 'right'},
            {id: 'c2', __commentSide: 'right'},
            {id: 'd1', __draft: true, __commentSide: 'right'},
            {id: 'd2', __draft: true, __commentSide: 'right'},
          ],
        }));

        element._removeComment({id: 'bc2', side: 'PARENT',
          __commentSide: 'left'});
        assert.deepEqual(element.comments, {
          meta: {
            changeNum: '42',
            patchRange: {
              basePatchNum: 'PARENT',
              patchNum: 3,
            },
            path: '/path/to/foo',
            projectConfig: {foo: 'bar'},
          },
          left: [
            {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
            {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
            {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
          ],
          right: [
            {id: 'c1', __commentSide: 'right'},
            {id: 'c2', __commentSide: 'right'},
            {id: 'd1', __draft: true, __commentSide: 'right'},
            {id: 'd2', __draft: true, __commentSide: 'right'},
          ],
        });

        element._removeComment({id: 'd2', __commentSide: 'right'});
        assert.deepEqual(element.comments, {
          meta: {
            changeNum: '42',
            patchRange: {
              basePatchNum: 'PARENT',
              patchNum: 3,
            },
            path: '/path/to/foo',
            projectConfig: {foo: 'bar'},
          },
          left: [
            {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
            {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
            {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
          ],
          right: [
            {id: 'c1', __commentSide: 'right'},
            {id: 'c2', __commentSide: 'right'},
            {id: 'd1', __draft: true, __commentSide: 'right'},
          ],
        });
      });

      test('thread groups', () => {
        const contentEl = document.createElement('div');
        const commentSide = 'left';
        const patchNum = 1;
        const side = 'PARENT';

        element.changeNum = 123;
        element.patchRange = {basePatchNum: 1, patchNum: 2};
        element.path = 'file.txt';

        const mock = document.createElement('mock-diff-response');
        element.$.diffBuilder._builder = element.$.diffBuilder._getDiffBuilder(
            mock.diffResponse, {left: [], right: []},
            {tab_size: 2, line_length: 80});

        // No thread groups.
        assert.isNotOk(element._getThreadGroupForLine(contentEl));

        // A thread group gets created.
        const threadGroupEl = element._getOrCreateThreadGroup(contentEl,
            patchNum, commentSide, side);
        assert.isOk(threadGroupEl);

        // The new thread group can be fetched.
        assert.isOk(element._getThreadGroupForLine(contentEl));

        assert.equal(contentEl.querySelectorAll(
            'gr-diff-comment-thread-group').length, 1);
      });

      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',
          };

          element.patchRange = {basePatchNum: 'PARENT', patchNum: 1};
          element.comments = {left: [], right: []};
          element.isImageDiff = true;
          element.prefs = {
            auto_hide_diff_table_header: true,
            context: 10,
            cursor_blink_rate: 0,
            font_size: 12,
            ignore_whitespace: 'IGNORE_NONE',
            intraline_difference: true,
            line_length: 100,
            line_wrapping: false,
            show_line_endings: true,
            show_tabs: true,
            show_whitespace_errors: true,
            syntax_highlighting: true,
            tab_size: 8,
            theme: 'DEFAULT',
          };
        });

        test('renders image diffs with same file name', done => {
          const rendered = () => {
            // Recognizes that it should be an image diff.
            assert.isTrue(element.isImageDiff);
            assert.instanceOf(
                element.$.diffBuilder._builder, GrDiffBuilderImage);

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

            const rightImage =
                element.$.diffTable.querySelector('td.right img');
            const rightLabel = element.$.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.baseImage = mockFile1;
          element.revisionImage = mockFile2;
          element.diff = {
            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,
          };
        });

        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,
          };

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

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

            const rightImage =
                element.$.diffTable.querySelector('td.right img');
            const rightLabel = element.$.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.baseImage = mockFile1;
          element.baseImage._name = mockDiff.meta_a.name;
          element.revisionImage = mockFile2;
          element.revisionImage._name = mockDiff.meta_b.name;
          element.diff = mockDiff;
        });

        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,
          };

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

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

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

          element.revisionImage = mockFile2;
          element.diff = mockDiff;
        });

        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,
          };

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

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

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

          element.baseImage = mockFile1;
          element.diff = mockDiff;
        });

        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';

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

          element.baseImage = mockFile1;
          element.diff = mockDiff;
        });
      });

      test('_handleTap lineNum', done => {
        const addDraftStub = sandbox.stub(element, 'addDraftAtLine');
        const el = document.createElement('div');
        el.className = 'lineNum';
        el.addEventListener('click', e => {
          element._handleTap(e);
          assert.isTrue(addDraftStub.called);
          assert.equal(addDraftStub.lastCall.args[0], el);
          done();
        });
        el.click();
      });

      test('_handleTap context', done => {
        const showContextStub =
            sandbox.stub(element.$.diffBuilder, 'showContext');
        const el = document.createElement('div');
        el.className = 'showContext';
        el.addEventListener('click', e => {
          element._handleTap(e);
          assert.isTrue(showContextStub.called);
          done();
        });
        el.click();
      });

      test('_handleTap content', done => {
        const content = document.createElement('div');
        const lineEl = document.createElement('div');

        const selectStub = sandbox.stub(element, '_selectLine');
        sandbox.stub(element.$.diffBuilder, 'getLineElByChild', () => lineEl);

        content.className = 'content';
        content.addEventListener('click', e => {
          element._handleTap(e);
          assert.isTrue(selectStub.called);
          assert.equal(selectStub.lastCall.args[0], lineEl);
          done();
        });
        content.click();
      });

      suite('getCursorStops', () => {
        const setupDiff = function() {
          const mock = document.createElement('mock-diff-response');
          element.diff = mock.diffResponse;
          element.comments = {
            left: [],
            right: [],
          };
          element.prefs = {
            context: 10,
            tab_size: 8,
            font_size: 12,
            line_length: 100,
            cursor_blink_rate: 0,
            line_wrapping: false,
            intraline_difference: true,
            show_line_endings: true,
            show_tabs: true,
            show_whitespace_errors: true,
            syntax_highlighting: true,
            auto_hide_diff_table_header: true,
            theme: 'DEFAULT',
            ignore_whitespace: 'IGNORE_NONE',
          };

          element._renderDiffTable();
          flushAsynchronousOperations();
        };

        test('getCursorStops returns [] when hidden and noAutoRender', () => {
          element.noAutoRender = true;
          setupDiff();
          element.hidden = true;
          assert.equal(element.getCursorStops().length, 0);
        });

        test('getCursorStops', () => {
          setupDiff();
          assert.equal(element.getCursorStops().length, 50);
        });
      });

      test('adds .hiddenscroll', () => {
        Gerrit.hiddenscroll = true;
        element.displayLine = true;
        assert.include(element.$$('.diffContainer').className, 'hiddenscroll');
      });
    });

    suite('logged in', () => {
      let fakeLineEl;
      setup(() => {
        element = fixture('basic');
        element.loggedIn = true;
        element.patchRange = {};

        fakeLineEl = {
          getAttribute: sandbox.stub().returns(42),
          classList: {
            contains: sandbox.stub().returns(true),
          },
        };
      });

      test('addDraftAtLine', () => {
        sandbox.stub(element, '_selectLine');
        sandbox.stub(element, '_createComment');
        element.addDraftAtLine(fakeLineEl);
        assert.isTrue(element._createComment
            .calledWithExactly(fakeLineEl, 42));
      });

      test('addDraftAtLine on an edit', () => {
        element.patchRange.basePatchNum = element.EDIT_NAME;
        sandbox.stub(element, '_selectLine');
        sandbox.stub(element, '_createComment');
        const alertSpy = sandbox.spy();
        element.addEventListener('show-alert', alertSpy);
        element.addDraftAtLine(fakeLineEl);
        assert.isTrue(alertSpy.called);
        assert.isFalse(element._createComment.called);
      });

      test('addDraftAtLine on an edit base', () => {
        element.patchRange.patchNum = element.EDIT_NAME;
        element.patchRange.basePatchNum = element.PARENT_NAME;
        sandbox.stub(element, '_selectLine');
        sandbox.stub(element, '_createComment');
        const alertSpy = sandbox.spy();
        element.addEventListener('show-alert', alertSpy);
        element.addDraftAtLine(fakeLineEl);
        assert.isTrue(alertSpy.called);
        assert.isFalse(element._createComment.called);
      });

      suite('change in preferences', () => {
        setup(() => {
          element.diff = {
            meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg', lines: 66},
            meta_b: {name: 'carrot.jpg', content_type: 'image/jpeg',
              lines: 560},
            diff_header: [],
            intraline_status: 'OK',
            change_type: 'MODIFIED',
            content: [{skip: 66}],
          };
          element.comments = {
            meta: {
              changeNum: '42',
              patchRange: {
                basePatchNum: 'PARENT',
                patchNum: 3,
              },
              path: '/path/to/foo',
              projectConfig: {foo: 'bar'},
            },
            left: [
              {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
              {id: 'bc2', side: 'PARENT', __commentSide: 'left'},
              {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
              {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
            ],
            right: [
              {id: 'c1', __commentSide: 'right'},
              {id: 'c2', __commentSide: 'right'},
              {id: 'd1', __draft: true, __commentSide: 'right'},
              {id: 'd2', __draft: true, __commentSide: 'right'},
            ],
          };
        });

        test('change in preferences re-renders diff', () => {
          sandbox.stub(element, '_renderDiffTable');
          element.prefs = {};
          element.prefs = {time_format: 'HHMM_12'};
          assert.isTrue(element._renderDiffTable.called);
        });

        test('change in preferences does not re-renders diff with ' +
            'noRenderOnPrefsChange', () => {
          sandbox.stub(element, '_renderDiffTable');
          element.noRenderOnPrefsChange = true;
          element.prefs = {};
          element.prefs = {time_format: 'HHMM_12'};
          assert.isFalse(element._renderDiffTable.called);
        });
      });

      suite('handle comment-update', () => {
        setup(() => {
          element.comments = {
            meta: {
              changeNum: '42',
              patchRange: {
                basePatchNum: 'PARENT',
                patchNum: 3,
              },
              path: '/path/to/foo',
              projectConfig: {foo: 'bar'},
            },
            left: [
              {id: 'bc1', side: 'PARENT', __commentSide: 'left'},
              {id: 'bc2', side: 'PARENT', __commentSide: 'left'},
              {id: 'bd1', __draft: true, side: 'PARENT', __commentSide: 'left'},
              {id: 'bd2', __draft: true, side: 'PARENT', __commentSide: 'left'},
            ],
            right: [
              {id: 'c1', __commentSide: 'right'},
              {id: 'c2', __commentSide: 'right'},
              {id: 'd1', __draft: true, __commentSide: 'right'},
              {id: 'd2', __draft: true, __commentSide: 'right'},
            ],
          };
        });

        test('creating a draft', () => {
          const comment = {__draft: true, __draftID: 'tempID', side: 'PARENT',
            __commentSide: 'left'};
          element.fire('comment-update', {comment});
          assert.include(element.comments.left, comment);
        });

        test('discarding a draft', () => {
          const draftID = 'tempID';
          const id = 'savedID';
          const comment = {
            __draft: true,
            __draftID: draftID,
            side: 'PARENT',
            __commentSide: 'left',
          };
          const diffCommentsModifiedStub = sandbox.stub();
          element.addEventListener('diff-comments-modified',
              diffCommentsModifiedStub);
          element.comments.left.push(comment);
          comment.id = id;
          element.fire('comment-discard', {comment});
          const drafts = element.comments.left.filter(item => {
            return item.__draftID === draftID;
          });
          assert.equal(drafts.length, 0);
          assert.isTrue(diffCommentsModifiedStub.called);
        });

        test('saving a draft', () => {
          const draftID = 'tempID';
          const id = 'savedID';
          const comment = {
            __draft: true,
            __draftID: draftID,
            side: 'PARENT',
            __commentSide: 'left',
          };
          const diffCommentsModifiedStub = sandbox.stub();
          element.addEventListener('diff-comments-modified',
              diffCommentsModifiedStub);
          element.comments.left.push(comment);
          comment.id = id;
          element.fire('comment-save', {comment});
          const drafts = element.comments.left.filter(item => {
            return item.__draftID === draftID;
          });
          assert.equal(drafts.length, 1);
          assert.equal(drafts[0].id, id);
          assert.isTrue(diffCommentsModifiedStub.called);
        });
      });
    });

    suite('diff header', () => {
      setup(() => {
        element = fixture('basic');
        element.diff = {
          meta_a: {name: 'carrot.jpg', content_type: 'image/jpeg', lines: 66},
          meta_b: {name: 'carrot.jpg', content_type: 'image/jpeg',
            lines: 560},
          diff_header: [],
          intraline_status: 'OK',
          change_type: 'MODIFIED',
          content: [{skip: 66}],
        };
      });

      test('hidden', () => {
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', 'diff --git a/test.jpg b/test.jpg');
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', 'index 2adc47d..f9c2f2c 100644');
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', '--- a/test.jpg');
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', '+++ b/test.jpg');
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', 'test');
        assert.equal(element._diffHeaderItems.length, 1);
        flushAsynchronousOperations();

        assert.equal(element.$.diffHeader.textContent.trim(), 'test');
      });

      test('binary files', () => {
        element.diff.binary = true;
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', 'diff --git a/test.jpg b/test.jpg');
        assert.equal(element._diffHeaderItems.length, 0);
        element.push('diff.diff_header', 'test');
        assert.equal(element._diffHeaderItems.length, 1);
        element.push('diff.diff_header', 'Binary files differ');
        assert.equal(element._diffHeaderItems.length, 1);
      });
    });

    suite('safety and bypass', () => {
      let renderStub;

      setup(() => {
        element = fixture('basic');
        renderStub = sandbox.stub(element.$.diffBuilder, 'render',
            () => {
              Promise.resolve();
              element.$.diffBuilder.dispatchEvent(
                  new CustomEvent('render', {bubbles: true}));
            });
        const mock = document.createElement('mock-diff-response');
        sandbox.stub(element.$.diffBuilder, 'getDiffLength').returns(10000);
        element.diff = mock.diffResponse;
        element.comments = {left: [], right: []};
        element.noRenderOnPrefsChange = true;
      });

      test('large render w/ context = 10', done => {
        element.prefs = {context: 10};
        element.addEventListener('render', () => {
          assert.isTrue(renderStub.called);
          assert.isFalse(element._showWarning);
          done();
        });
        element._renderDiffTable();
      });

      test('large render w/ whole file and bypass', done => {
        element.prefs = {context: -1};
        element._safetyBypass = 10;
        element.addEventListener('render', () => {
          assert.isTrue(renderStub.called);
          assert.isFalse(element._showWarning);
          done();
        });
        element._renderDiffTable();
      });

      test('large render w/ whole file and no bypass', done => {
        element.prefs = {context: -1};
        element.addEventListener('render', () => {
          assert.isFalse(renderStub.called);
          assert.isTrue(element._showWarning);
          done();
        });
        element._renderDiffTable();
      });
    });

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

      test('unsetting', () => {
        element.blame = [];
        const setBlameSpy = sandbox.spy(element.$.diffBuilder, 'setBlame');
        element.classList.add('showBlame');
        element.blame = null;
        assert.isTrue(setBlameSpy.calledWithExactly(null));
        assert.isFalse(element.classList.contains('showBlame'));
      });

      test('setting', () => {
        const mockBlame = [{id: 'commit id', ranges: [{start: 1, end: 2}]}];
        element.blame = mockBlame;
        assert.isTrue(element.classList.contains('showBlame'));
      });
    });

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

      suite('_lastChunkForSide', () => {
        test('deltas', () => {
          const diff = {content: [
            {a: ['foo', 'bar'], b: ['baz']},
            {ab: ['foo', 'bar', 'baz']},
            {b: ['foo']},
          ]};
          assert.equal(element._lastChunkForSide(diff, false), diff.content[2]);
          assert.equal(element._lastChunkForSide(diff, true), diff.content[1]);

          diff.content.push({a: ['foo'], b: ['bar']});
          assert.equal(element._lastChunkForSide(diff, false), diff.content[3]);
          assert.equal(element._lastChunkForSide(diff, true), diff.content[3]);
        });

        test('addition', () => {
          const diff = {content: [
            {b: ['foo', 'bar', 'baz']},
          ]};
          assert.equal(element._lastChunkForSide(diff, false), diff.content[0]);
          assert.isNull(element._lastChunkForSide(diff, true));
        });

        test('deletion', () => {
          const diff = {content: [
            {a: ['foo', 'bar', 'baz']},
          ]};
          assert.isNull(element._lastChunkForSide(diff, false));
          assert.equal(element._lastChunkForSide(diff, true), diff.content[0]);
        });

        test('empty', () => {
          const diff = {content: []};
          assert.isNull(element._lastChunkForSide(diff, false));
          assert.isNull(element._lastChunkForSide(diff, true));
        });
      });

      suite('_hasTrailingNewlines', () => {
        test('shared no trailing', () => {
          const diff = undefined;
          sandbox.stub(element, '_lastChunkForSide')
              .returns({ab: ['foo', 'bar']});
          assert.isFalse(element._hasTrailingNewlines(diff, false));
          assert.isFalse(element._hasTrailingNewlines(diff, true));
        });

        test('delta trailing in right', () => {
          const diff = undefined;
          sandbox.stub(element, '_lastChunkForSide')
              .returns({a: ['foo', 'bar'], b: ['baz', '']});
          assert.isTrue(element._hasTrailingNewlines(diff, false));
          assert.isFalse(element._hasTrailingNewlines(diff, true));
        });

        test('addition', () => {
          const diff = undefined;
          sandbox.stub(element, '_lastChunkForSide', (diff, leftSide) => {
            if (leftSide) { return null; }
            return {b: ['foo', '']};
          });
          assert.isTrue(element._hasTrailingNewlines(diff, false));
          assert.isNull(element._hasTrailingNewlines(diff, true));
        });

        test('deletion', () => {
          const diff = undefined;
          sandbox.stub(element, '_lastChunkForSide', (diff, leftSide) => {
            if (!leftSide) { return null; }
            return {a: ['foo']};
          });
          assert.isNull(element._hasTrailingNewlines(diff, false));
          assert.isFalse(element._hasTrailingNewlines(diff, true));
        });
      });

      test('_computeNewlineWarning', () => {
        const NO_NEWLINE_BASE = 'No newline at end of base file.';
        const NO_NEWLINE_REVISION = 'No newline at end of revision file.';

        let hasLeft;
        let hasRight;
        sandbox.stub(element, '_hasTrailingNewlines', (diff, left) => {
          if (left) { return hasLeft; }
          return hasRight;
        });
        const diff = undefined;

        // The revision has a trailing newline, but the base doesn't.
        hasLeft = true;
        hasRight = false;
        assert.equal(element._computeNewlineWarning(diff), NO_NEWLINE_REVISION);

        // Trailing newlines were undetermined in the revision.
        hasLeft = true;
        hasRight = null;
        assert.isNull(element._computeNewlineWarning(diff));

        // Missing trailing newlines in the base.
        hasLeft = false;
        hasRight = null;
        assert.equal(element._computeNewlineWarning(diff), NO_NEWLINE_BASE);

        // Missing trailing newlines in both.
        hasLeft = false;
        hasRight = false;
        assert.equal(element._computeNewlineWarning(diff),
            NO_NEWLINE_BASE + ' — ' + NO_NEWLINE_REVISION);
      });

      test('_computeNewlineWarningClass', () => {
        const hidden = 'newlineWarning hidden';
        const shown = 'newlineWarning';
        assert.equal(element._computeNewlineWarningClass(null, true), hidden);
        assert.equal(element._computeNewlineWarningClass('foo', true), hidden);
        assert.equal(element._computeNewlineWarningClass(null, false), hidden);
        assert.equal(element._computeNewlineWarningClass('foo', false), shown);
      });
    });
  });

  a11ySuite('basic');
</script>