/* eslint no-param-reassign: "off" */

import $ from 'jquery';
import { emojiFixtureMap, initEmojiMock, describeEmojiFields } from 'helpers/emoji';
import '~/lib/utils/jquery_at_who';
import GfmAutoComplete, { membersBeforeSave } from 'ee_else_ce/gfm_auto_complete';

import { TEST_HOST } from 'helpers/test_constants';
import { getJSONFixture } from 'helpers/fixtures';

import waitForPromises from 'jest/helpers/wait_for_promises';

import MockAdapter from 'axios-mock-adapter';
import AjaxCache from '~/lib/utils/ajax_cache';
import axios from '~/lib/utils/axios_utils';

const labelsFixture = getJSONFixture('autocomplete_sources/labels.json');

describe('GfmAutoComplete', () => {
  const fetchDataMock = { fetchData: jest.fn() };
  let gfmAutoCompleteCallbacks = GfmAutoComplete.prototype.getDefaultCallbacks.call(fetchDataMock);

  let atwhoInstance;
  let sorterValue;
  let filterValue;

  describe('DefaultOptions.filter', () => {
    let items;

    beforeEach(() => {
      jest.spyOn(fetchDataMock, 'fetchData');
      jest.spyOn($.fn.atwho.default.callbacks, 'filter').mockImplementation(() => {});
    });

    describe('assets loading', () => {
      beforeEach(() => {
        atwhoInstance = { setting: {}, $inputor: 'inputor', at: '[vulnerability:' };
        items = ['loading'];

        filterValue = gfmAutoCompleteCallbacks.filter.call(atwhoInstance, '', items);
      });

      it('should call the fetchData function without query', () => {
        expect(fetchDataMock.fetchData).toHaveBeenCalledWith('inputor', '[vulnerability:');
      });

      it('should not call the default atwho filter', () => {
        expect($.fn.atwho.default.callbacks.filter).not.toHaveBeenCalled();
      });

      it('should return the passed unfiltered items', () => {
        expect(filterValue).toEqual(items);
      });
    });

    describe('backend filtering', () => {
      beforeEach(() => {
        atwhoInstance = { setting: {}, $inputor: 'inputor', at: '[vulnerability:' };
        items = [];
      });

      describe('when previous query is different from current one', () => {
        beforeEach(() => {
          gfmAutoCompleteCallbacks = GfmAutoComplete.prototype.getDefaultCallbacks.call({
            previousQuery: 'oldquery',
            ...fetchDataMock,
          });
          filterValue = gfmAutoCompleteCallbacks.filter.call(atwhoInstance, 'newquery', items);
        });

        it('should call the fetchData function with query', () => {
          expect(fetchDataMock.fetchData).toHaveBeenCalledWith(
            'inputor',
            '[vulnerability:',
            'newquery',
          );
        });

        it('should not call the default atwho filter', () => {
          expect($.fn.atwho.default.callbacks.filter).not.toHaveBeenCalled();
        });

        it('should return the passed unfiltered items', () => {
          expect(filterValue).toEqual(items);
        });
      });

      describe('when previous query is not different from current one', () => {
        beforeEach(() => {
          gfmAutoCompleteCallbacks = GfmAutoComplete.prototype.getDefaultCallbacks.call({
            previousQuery: 'oldquery',
            ...fetchDataMock,
          });
          filterValue = gfmAutoCompleteCallbacks.filter.call(
            atwhoInstance,
            'oldquery',
            items,
            'searchKey',
          );
        });

        it('should not call the fetchData function', () => {
          expect(fetchDataMock.fetchData).not.toHaveBeenCalled();
        });

        it('should call the default atwho filter', () => {
          expect($.fn.atwho.default.callbacks.filter).toHaveBeenCalledWith(
            'oldquery',
            items,
            'searchKey',
          );
        });
      });
    });
  });

  describe('fetchData', () => {
    const { fetchData } = GfmAutoComplete.prototype;
    let mock;

    beforeEach(() => {
      mock = new MockAdapter(axios);
      jest.spyOn(axios, 'get');
      jest.spyOn(AjaxCache, 'retrieve');
    });

    afterEach(() => {
      mock.restore();
    });

    describe('already loading data', () => {
      beforeEach(() => {
        const context = {
          isLoadingData: { '[vulnerability:': true },
          dataSources: {},
          cachedData: {},
        };
        fetchData.call(context, {}, '[vulnerability:', '');
      });

      it('should not call either axios nor AjaxCache', () => {
        expect(axios.get).not.toHaveBeenCalled();
        expect(AjaxCache.retrieve).not.toHaveBeenCalled();
      });
    });

    describe('backend filtering', () => {
      describe('data is not in cache', () => {
        let context;

        beforeEach(() => {
          context = {
            isLoadingData: { '[vulnerability:': false },
            dataSources: { vulnerabilities: 'vulnerabilities_autocomplete_url' },
            cachedData: {},
          };
        });

        it('should call axios with query', () => {
          fetchData.call(context, {}, '[vulnerability:', 'query');

          expect(axios.get).toHaveBeenCalledWith('vulnerabilities_autocomplete_url', {
            params: { search: 'query' },
          });
        });

        it.each([200, 500])('should set the loading state', async responseStatus => {
          mock.onGet('vulnerabilities_autocomplete_url').replyOnce(responseStatus);

          fetchData.call(context, {}, '[vulnerability:', 'query');

          expect(context.isLoadingData['[vulnerability:']).toBe(true);

          await waitForPromises();

          expect(context.isLoadingData['[vulnerability:']).toBe(false);
        });
      });

      describe('data is in cache', () => {
        beforeEach(() => {
          const context = {
            isLoadingData: { '[vulnerability:': false },
            dataSources: { vulnerabilities: 'vulnerabilities_autocomplete_url' },
            cachedData: { '[vulnerability:': [{}] },
          };
          fetchData.call(context, {}, '[vulnerability:', 'query');
        });

        it('should anyway call axios with query ignoring cache', () => {
          expect(axios.get).toHaveBeenCalledWith('vulnerabilities_autocomplete_url', {
            params: { search: 'query' },
          });
        });
      });
    });

    describe('frontend filtering', () => {
      describe('data is not in cache', () => {
        beforeEach(() => {
          const context = {
            isLoadingData: { '#': false },
            dataSources: { issues: 'issues_autocomplete_url' },
            cachedData: {},
          };
          fetchData.call(context, {}, '#', 'query');
        });

        it('should call AjaxCache', () => {
          expect(AjaxCache.retrieve).toHaveBeenCalledWith('issues_autocomplete_url', true);
        });
      });

      describe('data is in cache', () => {
        beforeEach(() => {
          const context = {
            isLoadingData: { '#': false },
            dataSources: { issues: 'issues_autocomplete_url' },
            cachedData: { '#': [{}] },
            loadData: () => {},
          };
          fetchData.call(context, {}, '#', 'query');
        });

        it('should not call AjaxCache', () => {
          expect(AjaxCache.retrieve).not.toHaveBeenCalled();
        });
      });
    });
  });

  describe('DefaultOptions.sorter', () => {
    describe('assets loading', () => {
      let items;

      beforeEach(() => {
        jest.spyOn(GfmAutoComplete, 'isLoading').mockReturnValue(true);

        atwhoInstance = { setting: {} };
        items = [];

        sorterValue = gfmAutoCompleteCallbacks.sorter.call(atwhoInstance, '', items);
      });

      it('should disable highlightFirst', () => {
        expect(atwhoInstance.setting.highlightFirst).toBe(false);
      });

      it('should return the passed unfiltered items', () => {
        expect(sorterValue).toEqual(items);
      });
    });

    describe('assets finished loading', () => {
      beforeEach(() => {
        jest.spyOn(GfmAutoComplete, 'isLoading').mockReturnValue(false);
        jest.spyOn($.fn.atwho.default.callbacks, 'sorter').mockImplementation(() => {});
      });

      it('should enable highlightFirst if alwaysHighlightFirst is set', () => {
        atwhoInstance = { setting: { alwaysHighlightFirst: true } };

        gfmAutoCompleteCallbacks.sorter.call(atwhoInstance);

        expect(atwhoInstance.setting.highlightFirst).toBe(true);
      });

      it('should enable highlightFirst if a query is present', () => {
        atwhoInstance = { setting: {} };

        gfmAutoCompleteCallbacks.sorter.call(atwhoInstance, 'query');

        expect(atwhoInstance.setting.highlightFirst).toBe(true);
      });

      it('should call the default atwho sorter', () => {
        atwhoInstance = { setting: {} };

        const query = 'query';
        const items = [];
        const searchKey = 'searchKey';

        gfmAutoCompleteCallbacks.sorter.call(atwhoInstance, query, items, searchKey);

        expect($.fn.atwho.default.callbacks.sorter).toHaveBeenCalledWith(query, items, searchKey);
      });
    });
  });

  describe('DefaultOptions.beforeInsert', () => {
    const beforeInsert = (context, value) =>
      gfmAutoCompleteCallbacks.beforeInsert.call(context, value);

    beforeEach(() => {
      atwhoInstance = { setting: { skipSpecialCharacterTest: false } };
    });

    it('should not quote if value only contains alphanumeric charecters', () => {
      expect(beforeInsert(atwhoInstance, '@user1')).toBe('@user1');
      expect(beforeInsert(atwhoInstance, '~label1')).toBe('~label1');
    });

    it('should quote if value contains any non-alphanumeric characters', () => {
      expect(beforeInsert(atwhoInstance, '~label-20')).toBe('~"label-20"');
      expect(beforeInsert(atwhoInstance, '~label 20')).toBe('~"label 20"');
    });

    it('should quote integer labels', () => {
      expect(beforeInsert(atwhoInstance, '~1234')).toBe('~"1234"');
    });

    it('escapes Markdown strikethroughs when needed', () => {
      expect(beforeInsert(atwhoInstance, '~a~bug')).toEqual('~"a~bug"');
      expect(beforeInsert(atwhoInstance, '~a~~bug~~')).toEqual('~"a\\~~bug\\~~"');
    });

    it('escapes Markdown emphasis when needed', () => {
      expect(beforeInsert(atwhoInstance, '~a_bug_')).toEqual('~a_bug\\_');
      expect(beforeInsert(atwhoInstance, '~a _bug_')).toEqual('~"a \\_bug\\_"');
      expect(beforeInsert(atwhoInstance, '~a*bug*')).toEqual('~"a\\*bug\\*"');
      expect(beforeInsert(atwhoInstance, '~a *bug*')).toEqual('~"a \\*bug\\*"');
    });

    it('escapes Markdown code spans when needed', () => {
      expect(beforeInsert(atwhoInstance, '~a`bug`')).toEqual('~"a\\`bug\\`"');
      expect(beforeInsert(atwhoInstance, '~a `bug`')).toEqual('~"a \\`bug\\`"');
    });
  });

  describe('DefaultOptions.matcher', () => {
    const defaultMatcher = (context, flag, subtext) =>
      gfmAutoCompleteCallbacks.matcher.call(context, flag, subtext);

    const flagsUseDefaultMatcher = ['@', '#', '!', '~', '%', '$'];
    const otherFlags = ['/', ':'];
    const flags = flagsUseDefaultMatcher.concat(otherFlags);

    const flagsHash = flags.reduce((hash, el) => {
      hash[el] = null;
      return hash;
    }, {});

    beforeEach(() => {
      atwhoInstance = { setting: {}, app: { controllers: flagsHash } };
    });

    const minLen = 1;
    const maxLen = 20;
    const argumentSize = [minLen, maxLen / 2, maxLen];

    const allowedSymbols = [
      '',
      'a',
      'n',
      'z',
      'A',
      'Z',
      'N',
      '0',
      '5',
      '9',
      'А',
      'а',
      'Я',
      'я',
      '.',
      "'",
      '-',
      '_',
    ];
    const jointAllowedSymbols = allowedSymbols.join('');

    describe('should match regular symbols', () => {
      flagsUseDefaultMatcher.forEach(flag => {
        allowedSymbols.forEach(symbol => {
          argumentSize.forEach(size => {
            const query = new Array(size + 1).join(symbol);
            const subtext = flag + query;

            it(`matches argument "${flag}" with query "${subtext}"`, () => {
              expect(defaultMatcher(atwhoInstance, flag, subtext)).toBe(query);
            });
          });
        });

        it(`matches combination of allowed symbols for flag "${flag}"`, () => {
          const subtext = flag + jointAllowedSymbols;

          expect(defaultMatcher(atwhoInstance, flag, subtext)).toBe(jointAllowedSymbols);
        });
      });
    });

    describe('should not match special sequences', () => {
      const shouldNotBeFollowedBy = flags.concat(['\x00', '\x10', '\x3f', '\n', ' ']);
      const shouldNotBePrependedBy = ['`'];

      flagsUseDefaultMatcher.forEach(atSign => {
        shouldNotBeFollowedBy.forEach(followedSymbol => {
          const seq = atSign + followedSymbol;

          it(`should not match ${JSON.stringify(seq)}`, () => {
            expect(defaultMatcher(atwhoInstance, atSign, seq)).toBe(null);
          });
        });

        shouldNotBePrependedBy.forEach(prependedSymbol => {
          const seq = prependedSymbol + atSign;

          it(`should not match "${seq}"`, () => {
            expect(defaultMatcher(atwhoInstance, atSign, seq)).toBe(null);
          });
        });
      });
    });
  });

  describe('DefaultOptions.highlighter', () => {
    beforeEach(() => {
      atwhoInstance = { setting: {} };
    });

    it('should return li if no query is given', () => {
      const liTag = '<li></li>';

      const highlightedTag = gfmAutoCompleteCallbacks.highlighter.call(atwhoInstance, liTag);

      expect(highlightedTag).toEqual(liTag);
    });

    it('should highlight search query in li element', () => {
      const liTag = '<li><img src="" />string</li>';
      const query = 's';

      const highlightedTag = gfmAutoCompleteCallbacks.highlighter.call(atwhoInstance, liTag, query);

      expect(highlightedTag).toEqual('<li><img src="" /> <strong>s</strong>tring </li>');
    });

    it('should highlight search query with special char in li element', () => {
      const liTag = '<li><img src="" />te.st</li>';
      const query = '.';

      const highlightedTag = gfmAutoCompleteCallbacks.highlighter.call(atwhoInstance, liTag, query);

      expect(highlightedTag).toEqual('<li><img src="" /> te<strong>.</strong>st </li>');
    });
  });

  describe('isLoading', () => {
    it('should be true with loading data object item', () => {
      expect(GfmAutoComplete.isLoading({ name: 'loading' })).toBe(true);
    });

    it('should be true with loading data array', () => {
      expect(GfmAutoComplete.isLoading(['loading'])).toBe(true);
    });

    it('should be true with loading data object array', () => {
      expect(GfmAutoComplete.isLoading([{ name: 'loading' }])).toBe(true);
    });

    it('should be false with actual array data', () => {
      expect(
        GfmAutoComplete.isLoading([{ title: 'Foo' }, { title: 'Bar' }, { title: 'Qux' }]),
      ).toBe(false);
    });

    it('should be false with actual data item', () => {
      expect(GfmAutoComplete.isLoading({ title: 'Foo' })).toBe(false);
    });
  });

  describe('membersBeforeSave', () => {
    const mockGroup = {
      username: 'my-group',
      name: 'My Group',
      count: 2,
      avatar_url: './group.jpg',
      type: 'Group',
      mentionsDisabled: false,
    };

    it('should return the original object when username is null', () => {
      expect(membersBeforeSave([{ ...mockGroup, username: null }])).toEqual([
        { ...mockGroup, username: null },
      ]);
    });

    it('should set the text avatar if avatar_url is null', () => {
      expect(membersBeforeSave([{ ...mockGroup, avatar_url: null }])).toEqual([
        {
          username: 'my-group',
          avatarTag: '<div class="avatar rect-avatar center avatar-inline s26">M</div>',
          title: 'My Group (2)',
          search: 'my-group My Group',
          icon: '',
        },
      ]);
    });

    it('should set the image avatar if avatar_url is given', () => {
      expect(membersBeforeSave([mockGroup])).toEqual([
        {
          username: 'my-group',
          avatarTag:
            '<img src="./group.jpg" alt="my-group" class="avatar rect-avatar avatar-inline center s26"/>',
          title: 'My Group (2)',
          search: 'my-group My Group',
          icon: '',
        },
      ]);
    });

    it('should set mentions disabled icon if mentionsDisabled is set', () => {
      expect(membersBeforeSave([{ ...mockGroup, mentionsDisabled: true }])).toEqual([
        {
          username: 'my-group',
          avatarTag:
            '<img src="./group.jpg" alt="my-group" class="avatar rect-avatar avatar-inline center s26"/>',
          title: 'My Group',
          search: 'my-group My Group',
          icon:
            '<svg class="s16 vertical-align-middle gl-ml-2"><use xlink:href="undefined#notifications-off" /></svg>',
        },
      ]);
    });

    it('should set the right image classes for User type members', () => {
      expect(
        membersBeforeSave([
          { username: 'my-user', name: 'My User', avatar_url: './users.jpg', type: 'User' },
        ]),
      ).toEqual([
        {
          username: 'my-user',
          avatarTag:
            '<img src="./users.jpg" alt="my-user" class="avatar  avatar-inline center s26"/>',
          title: 'My User',
          search: 'my-user My User',
          icon: '',
        },
      ]);
    });
  });

  describe('Issues.insertTemplateFunction', () => {
    it('should return default template', () => {
      expect(GfmAutoComplete.Issues.insertTemplateFunction({ id: 5, title: 'Some Issue' })).toBe(
        '${atwho-at}${id}', // eslint-disable-line no-template-curly-in-string
      );
    });

    it('should return reference when reference is set', () => {
      expect(
        GfmAutoComplete.Issues.insertTemplateFunction({
          id: 5,
          title: 'Some Issue',
          reference: 'grp/proj#5',
        }),
      ).toBe('grp/proj#5');
    });
  });

  describe('Issues.templateFunction', () => {
    it('should return html with id and title', () => {
      expect(GfmAutoComplete.Issues.templateFunction({ id: 5, title: 'Some Issue' })).toBe(
        '<li><small>5</small> Some Issue</li>',
      );
    });

    it('should replace id with reference if reference is set', () => {
      expect(
        GfmAutoComplete.Issues.templateFunction({
          id: 5,
          title: 'Some Issue',
          reference: 'grp/proj#5',
        }),
      ).toBe('<li><small>grp/proj#5</small> Some Issue</li>');
    });
  });

  describe('Members.templateFunction', () => {
    it('should return html with avatarTag and username', () => {
      expect(
        GfmAutoComplete.Members.templateFunction({
          avatarTag: 'IMG',
          username: 'my-group',
          title: '',
          icon: '',
          availabilityStatus: '',
        }),
      ).toBe('<li>IMG my-group <small></small> </li>');
    });

    it('should add icon if icon is set', () => {
      expect(
        GfmAutoComplete.Members.templateFunction({
          avatarTag: 'IMG',
          username: 'my-group',
          title: '',
          icon: '<i class="icon"/>',
          availabilityStatus: '',
        }),
      ).toBe('<li>IMG my-group <small></small> <i class="icon"/></li>');
    });

    it('should add escaped title if title is set', () => {
      expect(
        GfmAutoComplete.Members.templateFunction({
          avatarTag: 'IMG',
          username: 'my-group',
          title: 'MyGroup+',
          icon: '<i class="icon"/>',
          availabilityStatus: '',
        }),
      ).toBe('<li>IMG my-group <small>MyGroup+</small> <i class="icon"/></li>');
    });

    it('should add user availability status if availabilityStatus is set', () => {
      expect(
        GfmAutoComplete.Members.templateFunction({
          avatarTag: 'IMG',
          username: 'my-group',
          title: '',
          icon: '<i class="icon"/>',
          availabilityStatus: '<span class="gl-text-gray-500"> (Busy)</span>',
        }),
      ).toBe(
        '<li>IMG my-group <small><span class="gl-text-gray-500"> (Busy)</span></small> <i class="icon"/></li>',
      );
    });
  });

  describe('labels', () => {
    const dataSources = {
      labels: `${TEST_HOST}/autocomplete_sources/labels`,
    };

    const allLabels = labelsFixture;
    const assignedLabels = allLabels.filter(label => label.set);
    const unassignedLabels = allLabels.filter(label => !label.set);

    let autocomplete;
    let $textarea;

    beforeEach(() => {
      setFixtures('<textarea></textarea>');
      autocomplete = new GfmAutoComplete(dataSources);
      $textarea = $('textarea');
      autocomplete.setup($textarea, { labels: true });
    });

    afterEach(() => {
      autocomplete.destroy();
    });

    const triggerDropdown = text => {
      $textarea
        .trigger('focus')
        .val(text)
        .caret('pos', -1);
      $textarea.trigger('keyup');

      return new Promise(window.requestAnimationFrame);
    };

    const getDropdownItems = () => {
      const dropdown = document.getElementById('at-view-labels');
      const items = dropdown.getElementsByTagName('li');
      return [].map.call(items, item => item.textContent.trim());
    };

    const expectLabels = ({ input, output }) =>
      triggerDropdown(input).then(() => {
        expect(getDropdownItems()).toEqual(output.map(label => label.title));
      });

    describe('with no labels assigned', () => {
      beforeEach(() => {
        autocomplete.cachedData['~'] = [...unassignedLabels];
      });

      it.each`
        input           | output
        ${'~'}          | ${unassignedLabels}
        ${'/label ~'}   | ${unassignedLabels}
        ${'/relabel ~'} | ${unassignedLabels}
        ${'/unlabel ~'} | ${[]}
      `('$input shows $output.length labels', expectLabels);
    });

    describe('with some labels assigned', () => {
      beforeEach(() => {
        autocomplete.cachedData['~'] = allLabels;
      });

      it.each`
        input           | output
        ${'~'}          | ${allLabels}
        ${'/label ~'}   | ${unassignedLabels}
        ${'/relabel ~'} | ${allLabels}
        ${'/unlabel ~'} | ${assignedLabels}
      `('$input shows $output.length labels', expectLabels);
    });

    describe('with all labels assigned', () => {
      beforeEach(() => {
        autocomplete.cachedData['~'] = [...assignedLabels];
      });

      it.each`
        input           | output
        ${'~'}          | ${assignedLabels}
        ${'/label ~'}   | ${[]}
        ${'/relabel ~'} | ${assignedLabels}
        ${'/unlabel ~'} | ${assignedLabels}
      `('$input shows $output.length labels', expectLabels);
    });
  });

  describe('emoji', () => {
    const { atom, heart, star } = emojiFixtureMap;
    const assertInserted = ({ input, subject, emoji }) =>
      expect(subject).toBe(`:${emoji?.name || input}:`);
    const assertTemplated = ({ input, subject, emoji, field }) =>
      expect(subject.replace(/\s+/g, ' ')).toBe(
        `<li>${field || input} <gl-emoji data-name="${emoji?.name || input}"></gl-emoji> </li>`,
      );

    let mock;

    beforeEach(async () => {
      mock = await initEmojiMock();

      await new GfmAutoComplete({}).loadEmojiData({ atwho() {}, trigger() {} }, ':');
      if (!GfmAutoComplete.glEmojiTag) throw new Error('emoji not loaded');
    });

    afterEach(() => {
      mock.restore();
    });

    describe.each`
      name                        | inputFormat           | assert
      ${'insertTemplateFunction'} | ${name => ({ name })} | ${assertInserted}
      ${'templateFunction'}       | ${name => name}       | ${assertTemplated}
    `('Emoji.$name', ({ name, inputFormat, assert }) => {
      const execute = (accessor, input, emoji) =>
        assert({
          input,
          emoji,
          field: accessor && accessor(emoji),
          subject: GfmAutoComplete.Emoji[name](inputFormat(input)),
        });

      describeEmojiFields('for $field', ({ accessor }) => {
        it('should work with lowercase', () => {
          execute(accessor, accessor(atom), atom);
        });

        it('should work with uppercase', () => {
          execute(accessor, accessor(atom).toUpperCase(), atom);
        });

        it('should work with partial value', () => {
          execute(accessor, accessor(atom).slice(1), atom);
        });
      });

      it('should work with unicode value', () => {
        execute(null, atom.moji, atom);
      });

      it('should pass through unknown value', () => {
        execute(null, 'foo bar baz');
      });
    });

    const expectEmojiOrder = (first, second) => {
      const keys = Object.keys(emojiFixtureMap);
      const firstIndex = keys.indexOf(first);
      const secondIndex = keys.indexOf(second);
      expect(firstIndex).toBeGreaterThanOrEqual(0);
      expect(secondIndex).toBeGreaterThanOrEqual(0);
      expect(firstIndex).toBeLessThan(secondIndex);
    };

    describe('Emoji.insertTemplateFunction', () => {
      it('should map ":heart" to :heart: [regression]', () => {
        // the bug mapped heart to black_heart because the latter sorted first
        expectEmojiOrder('black_heart', 'heart');

        const item = GfmAutoComplete.Emoji.insertTemplateFunction({ name: 'heart' });
        expect(item).toEqual(`:${heart.name}:`);
      });

      it('should map ":star" to :star: [regression]', () => {
        // the bug mapped star to custard because the latter sorted first
        expectEmojiOrder('custard', 'star');

        const item = GfmAutoComplete.Emoji.insertTemplateFunction({ name: 'star' });
        expect(item).toEqual(`:${star.name}:`);
      });
    });

    describe('Emoji.templateFunction', () => {
      it('should map ":heart" to ❤ [regression]', () => {
        // the bug mapped heart to black_heart because the latter sorted first
        expectEmojiOrder('black_heart', 'heart');

        const item = GfmAutoComplete.Emoji.templateFunction('heart')
          .replace(/(<gl-emoji)\s+(data-name)/, '$1 $2')
          .replace(/>\s+|\s+</g, s => s.trim());
        expect(item).toEqual(
          `<li>${heart.name}<gl-emoji data-name="${heart.name}"></gl-emoji></li>`,
        );
      });

      it('should map ":star" to ⭐ [regression]', () => {
        // the bug mapped star to custard because the latter sorted first
        expectEmojiOrder('custard', 'star');

        const item = GfmAutoComplete.Emoji.templateFunction('star')
          .replace(/(<gl-emoji)\s+(data-name)/, '$1 $2')
          .replace(/>\s+|\s+</g, s => s.trim());
        expect(item).toEqual(`<li>${star.name}<gl-emoji data-name="${star.name}"></gl-emoji></li>`);
      });
    });
  });
});