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diff --git a/spec/frontend/behaviors/gl_emoji_spec.js b/spec/frontend/behaviors/gl_emoji_spec.js
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+++ b/spec/frontend/behaviors/gl_emoji_spec.js
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+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
+import { initEmojiMap, EMOJI_VERSION } from '~/emoji';
+import installGlEmojiElement from '~/behaviors/gl_emoji';
+
+import * as EmojiUnicodeSupport from '~/emoji/support';
+import waitForPromises from 'jest/helpers/wait_for_promises';
+
+jest.mock('~/emoji/support');
+
+describe('gl_emoji', () => {
+  let mock;
+  const emojiData = getJSONFixture('emojis/emojis.json');
+
+  beforeAll(() => {
+    jest.spyOn(EmojiUnicodeSupport, 'default').mockReturnValue(true);
+    installGlEmojiElement();
+  });
+
+  function markupToDomElement(markup) {
+    const div = document.createElement('div');
+    div.innerHTML = markup;
+    document.body.appendChild(div);
+
+    return div.firstElementChild;
+  }
+
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+    mock.onGet(`/-/emojis/${EMOJI_VERSION}/emojis.json`).reply(200, emojiData);
+
+    return initEmojiMap().catch(() => {});
+  });
+
+  afterEach(() => {
+    mock.restore();
+
+    document.body.innerHTML = '';
+  });
+
+  describe.each([
+    [
+      'bomb emoji just with name attribute',
+      '<gl-emoji data-name="bomb"></gl-emoji>',
+      '<gl-emoji data-name="bomb" data-unicode-version="6.0" title="bomb">💣</gl-emoji>',
+      '<gl-emoji data-name="bomb" data-unicode-version="6.0" title="bomb"><img class="emoji" title=":bomb:" alt=":bomb:" src="/-/emojis/1/bomb.png" width="20" height="20" align="absmiddle"></gl-emoji>',
+    ],
+    [
+      'bomb emoji with name attribute and unicode version',
+      '<gl-emoji data-name="bomb" data-unicode-version="6.0">💣</gl-emoji>',
+      '<gl-emoji data-name="bomb" data-unicode-version="6.0">💣</gl-emoji>',
+      '<gl-emoji data-name="bomb" data-unicode-version="6.0"><img class="emoji" title=":bomb:" alt=":bomb:" src="/-/emojis/1/bomb.png" width="20" height="20" align="absmiddle"></gl-emoji>',
+    ],
+    [
+      'bomb emoji with sprite fallback',
+      '<gl-emoji data-fallback-sprite-class="emoji-bomb" data-name="bomb"></gl-emoji>',
+      '<gl-emoji data-fallback-sprite-class="emoji-bomb" data-name="bomb" data-unicode-version="6.0" title="bomb">💣</gl-emoji>',
+      '<gl-emoji data-fallback-sprite-class="emoji-bomb" data-name="bomb" data-unicode-version="6.0" title="bomb" class="emoji-icon emoji-bomb">💣</gl-emoji>',
+    ],
+    [
+      'bomb emoji with image fallback',
+      '<gl-emoji data-fallback-src="/bomb.png" data-name="bomb"></gl-emoji>',
+      '<gl-emoji data-fallback-src="/bomb.png" data-name="bomb" data-unicode-version="6.0" title="bomb">💣</gl-emoji>',
+      '<gl-emoji data-fallback-src="/bomb.png" data-name="bomb" data-unicode-version="6.0" title="bomb"><img class="emoji" title=":bomb:" alt=":bomb:" src="/bomb.png" width="20" height="20" align="absmiddle"></gl-emoji>',
+    ],
+    [
+      'invalid emoji',
+      '<gl-emoji data-name="invalid_emoji"></gl-emoji>',
+      '<gl-emoji data-name="grey_question" data-unicode-version="6.0" title="white question mark ornament">❔</gl-emoji>',
+      '<gl-emoji data-name="grey_question" data-unicode-version="6.0" title="white question mark ornament"><img class="emoji" title=":grey_question:" alt=":grey_question:" src="/-/emojis/1/grey_question.png" width="20" height="20" align="absmiddle"></gl-emoji>',
+    ],
+  ])('%s', (name, markup, withEmojiSupport, withoutEmojiSupport) => {
+    it(`renders correctly with emoji support`, async () => {
+      jest.spyOn(EmojiUnicodeSupport, 'default').mockReturnValue(true);
+      const glEmojiElement = markupToDomElement(markup);
+
+      await waitForPromises();
+
+      expect(glEmojiElement.outerHTML).toBe(withEmojiSupport);
+    });
+
+    it(`renders correctly without emoji support`, async () => {
+      jest.spyOn(EmojiUnicodeSupport, 'default').mockReturnValue(false);
+      const glEmojiElement = markupToDomElement(markup);
+
+      await waitForPromises();
+
+      expect(glEmojiElement.outerHTML).toBe(withoutEmojiSupport);
+    });
+  });
+
+  it('Adds sprite CSS if emojis are not supported', async () => {
+    const testPath = '/test-path.css';
+    jest.spyOn(EmojiUnicodeSupport, 'default').mockReturnValue(false);
+    window.gon.emoji_sprites_css_path = testPath;
+
+    expect(document.head.querySelector(`link[href="${testPath}"]`)).toBe(null);
+    expect(window.gon.emoji_sprites_css_added).toBeFalsy();
+
+    markupToDomElement(
+      '<gl-emoji data-fallback-sprite-class="emoji-bomb" data-name="bomb"></gl-emoji>',
+    );
+    await waitForPromises();
+
+    expect(document.head.querySelector(`link[href="${testPath}"]`).outerHTML).toBe(
+      '<link rel="stylesheet" href="/test-path.css">',
+    );
+    expect(window.gon.emoji_sprites_css_added).toBe(true);
+  });
+});