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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-reply-dialog</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-reply-dialog.html">

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

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

<script>
  suite('gr-reply-dialog tests', () => {
    let element;
    let changeNum;
    let patchNum;

    let sandbox;
    let getDraftCommentStub;
    let setDraftCommentStub;
    let eraseDraftCommentStub;

    let lastId = 0;
    const makeAccount = function() { return {_account_id: lastId++}; };
    const makeGroup = function() { return {id: lastId++}; };

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

      changeNum = 42;
      patchNum = 1;

      stub('gr-rest-api-interface', {
        getConfig() { return Promise.resolve({}); },
        getAccount() { return Promise.resolve({}); },
        getChange() { return Promise.resolve({}); },
        getChangeSuggestedReviewers() { return Promise.resolve([]); },
      });

      element = fixture('basic');
      element.change = {
        _number: changeNum,
        labels: {
          'Verified': {
            values: {
              '-1': 'Fails',
              ' 0': 'No score',
              '+1': 'Verified',
            },
            default_value: 0,
          },
          'Code-Review': {
            values: {
              '-2': 'Do not submit',
              '-1': 'I would prefer that you didn\'t submit this',
              ' 0': 'No score',
              '+1': 'Looks good to me, but someone else must approve',
              '+2': 'Looks good to me, approved',
            },
            default_value: 0,
          },
        },
      };
      element.patchNum = patchNum;
      element.permittedLabels = {
        'Code-Review': [
          '-1',
          ' 0',
          '+1',
        ],
        'Verified': [
          '-1',
          ' 0',
          '+1',
        ],
      };
      element.serverConfig = {};

      getDraftCommentStub = sandbox.stub(element.$.storage, 'getDraftComment');
      setDraftCommentStub = sandbox.stub(element.$.storage, 'setDraftComment');
      eraseDraftCommentStub = sandbox.stub(element.$.storage,
          'eraseDraftComment');

      sandbox.stub(element, 'fetchIsLatestKnown',
          () => { return Promise.resolve(true); });

      // Allow the elements created by dom-repeat to be stamped.
      flushAsynchronousOperations();
    });

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

    function stubSaveReview(jsonResponseProducer) {
      return sandbox.stub(element, '_saveReview', review => {
        return new Promise((resolve, reject) => {
          try {
            const result = jsonResponseProducer(review) || {};
            const resultStr =
                element.$.restAPI.JSON_PREFIX + JSON.stringify(result);
            resolve({
              ok: true,
              text() {
                return Promise.resolve(resultStr);
              },
            });
          } catch (err) {
            reject(err);
          }
        });
      });
    }

    test('default to publishing drafts with reply', done => {
      // Async tick is needed because iron-selector content is distributed and
      // distributed content requires an observer to be set up.
      // Note: Double flush seems to be needed in Safari. {@see Issue 4963}.
      flush(() => {
        flush(() => {
          element.draft = 'I wholeheartedly disapprove';

          stubSaveReview(review => {
            assert.deepEqual(review, {
              drafts: 'PUBLISH_ALL_REVISIONS',
              labels: {
                'Code-Review': 0,
                'Verified': 0,
              },
              message: 'I wholeheartedly disapprove',
              reviewers: [],
            });
            assert.isFalse(element.$.commentList.hidden);
            done();
          });

          // This is needed on non-Blink engines most likely due to the ways in
          // which the dom-repeat elements are stamped.
          flush(() => {
            MockInteractions.tap(element.$$('.send'));
          });
        });
      });
    });

    test('keep drafts with reply', done => {
      MockInteractions.tap(element.$$('#includeComments'));
      assert.equal(element._includeComments, false);

      // Async tick is needed because iron-selector content is distributed and
      // distributed content requires an observer to be set up.
      // Note: Double flush seems to be needed in Safari. {@see Issue 4963}.
      flush(() => {
        flush(() => {
          element.draft = 'I wholeheartedly disapprove';

          stubSaveReview(review => {
            assert.deepEqual(review, {
              drafts: 'KEEP',
              labels: {
                'Code-Review': 0,
                'Verified': 0,
              },
              message: 'I wholeheartedly disapprove',
              reviewers: [],
            });
            assert.isTrue(element.$.commentList.hidden);
            done();
          });

          // This is needed on non-Blink engines most likely due to the ways in
          // which the dom-repeat elements are stamped.
          flush(() => {
            MockInteractions.tap(element.$$('.send'));
          });
        });
      });
    });

    test('label picker', done => {
      element.draft = 'I wholeheartedly disapprove';
      stubSaveReview(review => {
        assert.deepEqual(review, {
          drafts: 'PUBLISH_ALL_REVISIONS',
          labels: {
            'Code-Review': -1,
            'Verified': -1,
          },
          message: 'I wholeheartedly disapprove',
          reviewers: [],
        });
      });

      sandbox.stub(element.$.labelScores, 'getLabelValues', () => {
        return {
          'Code-Review': -1,
          'Verified': -1,
        };
      });

      element.addEventListener('send', () => {
        // Flush to ensure properties are updated.
        flush(() => {
          assert.isFalse(element.disabled,
              'Element should be enabled when done sending reply.');
          assert.equal(element.draft.length, 0);
          done();
        });
      });

      // This is needed on non-Blink engines most likely due to the ways in
      // which the dom-repeat elements are stamped.
      flush(() => {
        MockInteractions.tap(element.$$('.send'));
        assert.isTrue(element.disabled);
      });
    });

    test('getlabelValue returns value', done => {
      flush(() => {
        element.$$('gr-label-scores').$$(`gr-label-score-row[name="Verified"]`)
            .setSelectedValue(-1);
        assert.equal('-1', element.getLabelValue('Verified'));
        done();
      });
    });

    test('getlabelValue when no score is selected', done => {
      flush(() => {
        element.$$('gr-label-scores').$$(`gr-label-score-row[name="Code-Review"]`)
            .setSelectedValue(-1);
        assert.strictEqual(element.getLabelValue('Verified'), ' 0');
        done();
      });
    });

    test('setlabelValue', () => {
      element._account = {_account_id: 1};
      flushAsynchronousOperations();
      const label = 'Verified';
      const value = '+1';
      element.setLabelValue(label, value);
      flushAsynchronousOperations();
      const labels = element.$.labelScores.getLabelValues();
      assert.deepEqual(labels, {
        'Code-Review': 0,
        'Verified': 1,
      });
    });

    function getActiveElement() {
      return Polymer.IronOverlayManager.deepActiveElement;
    }

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

    function overlayObserver(mode) {
      return new Promise(resolve => {
        function listener() {
          element.removeEventListener('iron-overlay-' + mode, listener);
          resolve();
        }
        element.addEventListener('iron-overlay-' + mode, listener);
      });
    }

    function testConfirmationDialog(done, cc) {
      const yesButton =
          element.$$('.reviewerConfirmationButtons gr-button:first-child');
      const noButton =
          element.$$('.reviewerConfirmationButtons gr-button:last-child');

      element.serverConfig = {note_db_enabled: true};
      element._ccPendingConfirmation = null;
      element._reviewerPendingConfirmation = null;
      flushAsynchronousOperations();
      assert.isFalse(isVisible(element.$.reviewerConfirmationOverlay));

      // Cause the confirmation dialog to display.
      let observer = overlayObserver('opened');
      const group = {
        id: 'id',
        name: 'name',
      };
      if (cc) {
        element._ccPendingConfirmation = {
          group,
          count: 10,
        };
      } else {
        element._reviewerPendingConfirmation = {
          group,
          count: 10,
        };
      }
      flushAsynchronousOperations();

      if (cc) {
        assert.deepEqual(
            element._ccPendingConfirmation,
            element._pendingConfirmationDetails);
      } else {
        assert.deepEqual(
            element._reviewerPendingConfirmation,
            element._pendingConfirmationDetails);
      }

      observer.then(() => {
        assert.isTrue(isVisible(element.$.reviewerConfirmationOverlay));
        observer = overlayObserver('closed');
        const expected = 'Group name has 10 members';
        assert.notEqual(
            element.$.reviewerConfirmationOverlay.innerText.indexOf(expected),
            -1);
        MockInteractions.tap(noButton); // close the overlay
        return observer;
      }).then(() => {
        assert.isFalse(isVisible(element.$.reviewerConfirmationOverlay));

        // We should be focused on account entry input.
        assert.equal(getActiveElement().id, 'input');

        // No reviewer/CC should have been added.
        assert.equal(element.$$('#ccs').additions().length, 0);
        assert.equal(element.$.reviewers.additions().length, 0);

        // Reopen confirmation dialog.
        observer = overlayObserver('opened');
        if (cc) {
          element._ccPendingConfirmation = {
            group,
            count: 10,
          };
        } else {
          element._reviewerPendingConfirmation = {
            group,
            count: 10,
          };
        }
        return observer;
      }).then(() => {
        assert.isTrue(isVisible(element.$.reviewerConfirmationOverlay));
        observer = overlayObserver('closed');
        MockInteractions.tap(yesButton); // Confirm the group.
        return observer;
      }).then(() => {
        assert.isFalse(isVisible(element.$.reviewerConfirmationOverlay));
        const additions = cc ?
            element.$$('#ccs').additions() :
            element.$.reviewers.additions();
        assert.deepEqual(
            additions,
            [
              {
                group: {
                  id: 'id',
                  name: 'name',
                  confirmed: true,
                  _group: true,
                  _pendingAdd: true,
                },
              },
            ]);

        // We should be focused on account entry input.
        assert.equal(getActiveElement().id, 'input');
      }).then(done);
    }

    test('cc confirmation', done => {
      testConfirmationDialog(done, true);
    });

    test('reviewer confirmation', done => {
      testConfirmationDialog(done, false);
    });

    test('_getStorageLocation', () => {
      const actual = element._getStorageLocation();
      assert.equal(actual.changeNum, changeNum);
      assert.equal(actual.patchNum, '@change');
      assert.equal(actual.path, '@change');
    });

    test('gets draft from storage on open', () => {
      const storedDraft = 'hello world';
      getDraftCommentStub.returns({message: storedDraft});
      element.open();
      assert.isTrue(getDraftCommentStub.called);
      assert.equal(element.draft, storedDraft);
    });

    test('blank if no stored draft', () => {
      getDraftCommentStub.returns(null);
      element.open();
      assert.isTrue(getDraftCommentStub.called);
      assert.equal(element.draft, '');
    });

    test('updates stored draft on edits', () => {
      const firstEdit = 'hello';
      const location = element._getStorageLocation();

      element.draft = firstEdit;
      element.flushDebouncer('store');

      assert.isTrue(setDraftCommentStub.calledWith(location, firstEdit));

      element.draft = '';
      element.flushDebouncer('store');

      assert.isTrue(eraseDraftCommentStub.calledWith(location));
    });

    test('400 converts to human-readable server-error', done => {
      sandbox.stub(window, 'fetch', () => {
        const text = '....{"reviewers":{"id1":{"error":"first error"}},' +
          '"ccs":{"id2":{"error":"second error"}}}';
        return Promise.resolve({
          ok: false,
          status: 400,
          text() { return Promise.resolve(text); },
        });
      });

      element.addEventListener('server-error', event => {
        if (event.target !== element) {
          return;
        }
        event.detail.response.text().then(body => {
          assert.equal(body, 'first error, second error');
          done();
        });
      });

      // Async tick is needed because iron-selector content is distributed and
      // distributed content requires an observer to be set up.
      flush(() => { element.send(); });
    });

    test('ccs are displayed if NoteDb is enabled', () => {
      function hasCc() {
        flushAsynchronousOperations();
        return !!element.$$('#ccs');
      }

      element.serverConfig = {};
      assert.isFalse(hasCc());

      element.serverConfig = {note_db_enabled: true};
      assert.isTrue(hasCc());
    });

    test('filterReviewerSuggestion', () => {
      const owner = makeAccount();
      const reviewer1 = makeAccount();
      const reviewer2 = makeGroup();
      const cc1 = makeAccount();
      const cc2 = makeGroup();
      let filter = element._filterReviewerSuggestionGenerator(false);

      element._owner = owner;
      element._reviewers = [reviewer1, reviewer2];
      element._ccs = [cc1, cc2];

      assert.isTrue(filter({account: makeAccount()}));
      assert.isTrue(filter({group: makeGroup()}));

      // Owner should be excluded.
      assert.isFalse(filter({account: owner}));

      // Existing and pending reviewers should be excluded when isCC = false.
      assert.isFalse(filter({account: reviewer1}));
      assert.isFalse(filter({group: reviewer2}));

      filter = element._filterReviewerSuggestionGenerator(true);

      // Existing and pending CCs should be excluded when isCC = true;.
      assert.isFalse(filter({account: cc1}));
      assert.isFalse(filter({group: cc2}));
    });

    test('_chooseFocusTarget', () => {
      element._account = null;
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.BODY);

      element._account = {_account_id: 1};
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.BODY);

      element.change.owner = {_account_id: 2};
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.BODY);

      element.change.owner._account_id = 1;
      element.change._reviewers = null;
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.REVIEWERS);

      element._reviewers = [];
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.REVIEWERS);

      element._reviewers.push({});
      assert.strictEqual(
          element._chooseFocusTarget(), element.FocusTarget.BODY);
    });

    test('only send labels that have changed', done => {
      flush(() => {
        stubSaveReview(review => {
          assert.deepEqual(review.labels, {
            'Code-Review': 0,
            'Verified': -1,
          });
        });

        element.addEventListener('send', () => {
          done();
        });
        // Without wrapping this test in flush(), the below two calls to
        // MockInteractions.tap() cause a race in some situations in shadow DOM.
        // The send button can be tapped before the others, causing the test to
        // fail.

        element.$$('gr-label-scores').$$(
            'gr-label-score-row[name="Verified"]').setSelectedValue(-1);
        MockInteractions.tap(element.$$('.send'));
      });
    });

    test('_processReviewerChange', () => {
      const mockIndexSplices = function(toRemove) {
        return [{
          removed: [toRemove],
        }];
      };

      element._processReviewerChange(
          mockIndexSplices(makeAccount()), 'REVIEWER');
      assert.equal(element._reviewersPendingRemove.REVIEWER.length, 1);
    });

    test('_purgeReviewersPendingRemove', () => {
      const removeStub = sandbox.stub(element, '_removeAccount');
      const mock = function() {
        element._reviewersPendingRemove = {
          test: [makeAccount()],
          test2: [makeAccount(), makeAccount()],
        };
      };
      const checkObjEmpty = function(obj) {
        for (const prop in obj) {
          if (obj.hasOwnProperty(prop) && obj[prop].length) { return false; }
        }
        return true;
      };
      mock();
      element._purgeReviewersPendingRemove(true); // Cancel
      assert.isFalse(removeStub.called);
      assert.isTrue(checkObjEmpty(element._reviewersPendingRemove));

      mock();
      element._purgeReviewersPendingRemove(false); // Submit
      assert.isTrue(removeStub.called);
      assert.isTrue(checkObjEmpty(element._reviewersPendingRemove));
    });

    test('_removeAccount', done => {
      sandbox.stub(element.$.restAPI, 'removeChangeReviewer')
          .returns(Promise.resolve({ok: true}));
      const arr = [makeAccount(), makeAccount()];
      element.change.reviewers = {
        REVIEWER: arr.slice(),
      };

      element._removeAccount(arr[1], 'REVIEWER').then(() => {
        assert.equal(element.change.reviewers.REVIEWER.length, 1);
        assert.deepEqual(element.change.reviewers.REVIEWER, arr.slice(0, 1));
        done();
      });
    });

    test('moving from cc to reviewer', () => {
      element.serverConfig = {note_db_enabled: true};
      element._reviewersPendingRemove = {
        CC: [],
        REVIEWER: [],
      };
      flushAsynchronousOperations();

      const reviewer1 = makeAccount();
      const reviewer2 = makeAccount();
      const reviewer3 = makeAccount();
      const cc1 = makeAccount();
      const cc2 = makeAccount();
      const cc3 = makeAccount();
      const cc4 = makeAccount();
      element._reviewers = [reviewer1, reviewer2, reviewer3];
      element._ccs = [cc1, cc2, cc3, cc4];
      element.push('_reviewers', cc1);
      flushAsynchronousOperations();

      assert.deepEqual(element._reviewers,
          [reviewer1, reviewer2, reviewer3, cc1]);
      assert.deepEqual(element._ccs, [cc2, cc3, cc4]);
      assert.deepEqual(element._reviewersPendingRemove.CC, [cc1]);

      element.push('_reviewers', cc4, cc3);
      flushAsynchronousOperations();

      assert.deepEqual(element._reviewers,
          [reviewer1, reviewer2, reviewer3, cc1, cc4, cc3]);
      assert.deepEqual(element._ccs, [cc2]);
      assert.deepEqual(element._reviewersPendingRemove.CC, [cc1, cc4, cc3]);
    });

    test('migrate reviewers between states', done => {
      element.serverConfig = {note_db_enabled: true};
      element._reviewersPendingRemove = {
        CC: [],
        REVIEWER: [],
      };
      flushAsynchronousOperations();
      const reviewers = element.$.reviewers;
      const ccs = element.$$('#ccs');
      const reviewer1 = makeAccount();
      const reviewer2 = makeAccount();
      const cc1 = makeAccount();
      const cc2 = makeAccount();
      const cc3 = makeAccount();
      element._reviewers = [reviewer1, reviewer2];
      element._ccs = [cc1, cc2, cc3];

      const mutations = [];

      stubSaveReview(review => mutations.push(...review.reviewers));

      sandbox.stub(element, '_removeAccount', (account, type) => {
        mutations.push({state: 'REMOVED', account});
        return Promise.resolve();
      });

      // Remove and add to other field.
      reviewers.fire('remove', {account: reviewer1});
      ccs.$.entry.fire('add', {value: {account: reviewer1}});
      ccs.fire('remove', {account: cc1});
      ccs.fire('remove', {account: cc3});
      reviewers.$.entry.fire('add', {value: {account: cc1}});

      // Add to other field without removing from former field.
      // (Currently not possible in UI, but this is a good consistency check).
      reviewers.$.entry.fire('add', {value: {account: cc2}});
      ccs.$.entry.fire('add', {value: {account: reviewer2}});
      const mapReviewer = function(reviewer, opt_state) {
        const result = {reviewer: reviewer._account_id, confirmed: undefined};
        if (opt_state) {
          result.state = opt_state;
        }
        return result;
      };

      // Send and purge and verify moves, delete cc3.
      element.send()
          .then(keepReviewers =>
              element._purgeReviewersPendingRemove(false, keepReviewers))
          .then(() => {
            assert.deepEqual(
                mutations, [
                  mapReviewer(cc1),
                  mapReviewer(cc2),
                  mapReviewer(reviewer1, 'CC'),
                  mapReviewer(reviewer2, 'CC'),
                  {account: cc3, state: 'REMOVED'},
                ]);
            done();
          });
    });

    test('emits cancel on esc key', () => {
      const cancelHandler = sandbox.spy();
      element.addEventListener('cancel', cancelHandler);
      MockInteractions.pressAndReleaseKeyOn(element, 27, null, 'esc');
      flushAsynchronousOperations();

      assert.isTrue(cancelHandler.called);
    });

    test('should not send on enter key', () => {
      stubSaveReview(() => undefined);
      element.addEventListener('send', () => assert.fail('wrongly called'));
      MockInteractions.pressAndReleaseKeyOn(element, 13, null, 'enter');
      flushAsynchronousOperations();
    });

    test('emit send on ctrl+enter key', done => {
      stubSaveReview(() => undefined);
      element.addEventListener('send', () => done());
      MockInteractions.pressAndReleaseKeyOn(element, 13, 'ctrl', 'enter');
      flushAsynchronousOperations();
    });

    test('_computeMessagePlaceholder', () => {
      assert.equal(
          element._computeMessagePlaceholder(false),
          'Say something nice...');
      assert.equal(
          element._computeMessagePlaceholder(true),
          'Add a note for your reviewers...');
    });

    test('_computeSendButtonLabel', () => {
      assert.equal(
          element._computeSendButtonLabel(false),
          'Send');
      assert.equal(
          element._computeSendButtonLabel(true),
          'Start review');
    });

    test('_handle400Error reviewrs and CCs', done => {
      const error1 = 'error 1';
      const error2 = 'error 2';
      const error3 = 'error 3';
      const response = {
        status: 400,
        text() {
          return Promise.resolve(')]}\'' + JSON.stringify({
            reviewers: {
              username1: {
                input: 'user 1',
                error: error1,
              },
              username2: {
                input: 'user 2',
                error: error2,
              },
            },
            ccs: {
              username3: {
                input: 'user 3',
                error: error3,
              },
            },
          }));
        },
      };
      element.addEventListener('server-error', e => {
        e.detail.response.text().then(text => {
          assert.equal(text, [error1, error2, error3].join(', '));
          done();
        });
      });
      element._handle400Error(response);
    });

    test('_handle400Error CCs only', done => {
      const error1 = 'error 1';
      const response = {
        status: 400,
        text() {
          return Promise.resolve(')]}\'' + JSON.stringify({
            ccs: {
              username1: {
                input: 'user 1',
                error: error1,
              },
            },
          }));
        },
      };
      element.addEventListener('server-error', e => {
        e.detail.response.text().then(text => {
          assert.equal(text, error1);
          done();
        });
      });
      element._handle400Error(response);
    });

    test('fires height change when the drafts load', done => {
      // Flush DOM operations before binding to the autogrow event so we don't
      // catch the events fired from the initial layout.
      flush(() => {
        const autoGrowHandler = sinon.stub();
        element.addEventListener('autogrow', autoGrowHandler);
        element.diffDrafts = {};
        flush(() => {
          assert.isTrue(autoGrowHandler.called);
          done();
        });
      });
    });

    suite('post review API', () => {
      let startReviewStub;

      setup(() => {
        startReviewStub = sandbox.stub(element.$.restAPI, 'startReview', () => {
          return Promise.resolve();
        });
      });

      test('ready property in review input on start review', () => {
        stubSaveReview(review => {
          assert.isTrue(review.ready);
          return {ready: true};
        });
        return element.send(true, true).then(() => {
          assert.isFalse(startReviewStub.called);
        });
      });

      test('no ready property in review input on save review', () => {
        stubSaveReview(review => {
          assert.isUndefined(review.ready);
        });
        return element.send(true, false).then(() => {
          assert.isFalse(startReviewStub.called);
        });
      });

      test('fall back to start review against old backend', () => {
        stubSaveReview(review => {
          return {}; // old backend won't set ready: true
        });

        return element.send(true, true).then(() => {
          assert.isTrue(startReviewStub.called);
        }).then(() => {
          startReviewStub.reset();
          return element.send(true, false);
        }).then(() => {
          assert.isFalse(startReviewStub.called);
        });
      });
    });

    suite('start review and save buttons', () => {
      let sendStub;

      setup(() => {
        sendStub = sandbox.stub(element, 'send', () => Promise.resolve());
        element.canBeStarted = true;
        // Flush to make both Start/Save buttons appear in DOM.
        flushAsynchronousOperations();
      });

      test('start review sets ready', () => {
        MockInteractions.tap(element.$$('.send'));
        flushAsynchronousOperations();
        assert.isTrue(sendStub.calledWith(true, true));
      });

      test('save review doesn\'t set ready', () => {
        MockInteractions.tap(element.$$('.save'));
        flushAsynchronousOperations();
        assert.isTrue(sendStub.calledWith(true, false));
      });
    });

    test('dummy message to force email on start review', () => {
      stubSaveReview(review => {
        assert.equal(review.message, element.START_REVIEW_MESSAGE);
        return {ready: true};
      });
      return element.send(true, true);
    });

    test('buttons disabled until all API calls are resolved', () => {
      stubSaveReview(review => {
        return {}; // old backend won't set ready: true
      });
      // Check that element is disabled asynchronously after the setReady
      // promise is returned. The element should not be reenabled until
      // that promise is resolved.
      sandbox.stub(element, '_maybeSetReady', (startReview, response) => {
        return new Promise(resolve => {
          Polymer.Base.async(() => {
            assert.isTrue(element.disabled);
            resolve();
          });
        });
      });
      return element.send(true, true).then(() => {
        assert.isFalse(element.disabled);
      });
    });

    suite('error handling', () => {
      const expectedDraft = 'draft';
      const expectedError = new Error('test');

      setup(() => {
        element.draft = expectedDraft;
      });

      function assertDialogOpenAndEnabled() {
        assert.strictEqual(expectedDraft, element.draft);
        assert.isFalse(element.disabled);
      }

      function assertDialogClosed() {
        assert.strictEqual('', element.draft);
        assert.isFalse(element.disabled);
      }

      test('error occurs in _saveReview', () => {
        stubSaveReview(review => {
          throw expectedError;
        });
        return element.send(true, true).catch(err => {
          assert.strictEqual(expectedError, err);
          assertDialogOpenAndEnabled();
        });
      });

      test('error occurs during startReview', () => {
        stubSaveReview(review => {
          return {}; // old backend won't set ready: true
        });
        const errorStub = sandbox.stub(
            console, 'error', (msg, err) => undefined);
        sandbox.stub(element.$.restAPI, 'startReview', () => {
          throw expectedError;
        });
        return element.send(true, true).then(() => {
          assertDialogClosed();
          assert.isTrue(
              errorStub.calledWith('error setting ready:', expectedError));
        });
      });

      test('non-ok response received by startReview', () => {
        stubSaveReview(review => {
          return {}; // old backend won't set ready: true
        });
        sandbox.stub(element.$.restAPI, 'startReview', (c, b, f) => {
          f({status: 500});
        });
        return element.send(true, true).then(() => {
          assertDialogClosed();
        });
      });

      test('409 response received by startReview', () => {
        stubSaveReview(review => {
          return {}; // old backend won't set ready: true
        });
        sandbox.stub(element.$.restAPI, 'startReview', (c, b, f) => {
          f({status: 409});
        });
        return element.send(true, true).then(() => {
          assertDialogClosed();
        });
      });

      suite('pending diff drafts?', () => {
        test('yes', () => {
          const promise = mockPromise();
          const refreshHandler = sandbox.stub();

          element.addEventListener('comment-refresh', refreshHandler);
          sandbox.stub(element.$.restAPI, 'hasPendingDiffDrafts').returns(true);
          element.$.restAPI._pendingRequests.sendDiffDraft = [promise];
          element.open();

          assert.isFalse(refreshHandler.called);
          assert.isTrue(element._savingComments);

          promise.resolve();

          return element.$.restAPI.awaitPendingDiffDrafts().then(() => {
            assert.isTrue(refreshHandler.called);
            assert.isFalse(element._savingComments);
          });
        });

        test('no', () => {
          sandbox.stub(element.$.restAPI, 'hasPendingDiffDrafts').returns(false);
          element.open();
          assert.notOk(element._savingComments);
        });
      });
    });

    test('_computeSendButtonDisabled', () => {
      const fn = element._computeSendButtonDisabled.bind(element);
      assert.isTrue(fn('not-latest'));
      assert.isFalse(fn('latest', 'Start review'));
      assert.isTrue(fn('latest', 'Send', {}, '', false, false, false));
      // Mock nonempty comment draft array, with seding comments.
      assert.isFalse(fn('latest', 'Send', {file: ['draft']}, '', false, false,
          true));
      // Mock nonempty comment draft array, without seding comments.
      assert.isTrue(fn('latest', 'Send', {file: ['draft']}, '', false, false,
          false));
      // Mock nonempty change message.
      assert.isFalse(fn('latest', 'Send', {}, 'test', false, false, false));
      // Mock reviewers mutated.
      assert.isFalse(fn('latest', 'Send', {}, '', true, false, false));
      // Mock labels changed.
      assert.isFalse(fn('latest', 'Send', {}, '', false, true, false));
    });
  });
</script>