Add test for AutosuggestEmoji (#8805)

app/javascript/mastodon/components/__tests__/__snapshots__/autosuggest_emoji-test.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<AutosuggestEmoji /> renders emoji with custom url 1`] = `
+<div
+  className="autosuggest-emoji"
+>
+  <img
+    alt="foobar"
+    className="emojione"
+    src="http://example.com/emoji.png"
+  />
+  :foobar:
+</div>
+`;
+
+exports[`<AutosuggestEmoji /> renders native emoji 1`] = `
+<div
+  className="autosuggest-emoji"
+>
+  <img
+    alt="💙"
+    className="emojione"
+    src="/emoji/1f499.svg"
+  />
+  :foobar:
+</div>
+`;

app/javascript/mastodon/components/__tests__/autosuggest_emoji-test.js

+import React from 'react';
+import renderer from 'react-test-renderer';
+import AutosuggestEmoji from '../autosuggest_emoji';
+
+describe('<AutosuggestEmoji />', () => {
+  it('renders native emoji', () => {
+    const emoji = {
+      native: '💙',
+      colons: ':foobar:',
+    };
+    const component = renderer.create(<AutosuggestEmoji emoji={emoji} />);
+    const tree      = component.toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders emoji with custom url', () => {
+    const emoji = {
+      custom: true,
+      imageUrl: 'http://example.com/emoji.png',
+      native: 'foobar',
+      colons: ':foobar:',
+    };
+    const component = renderer.create(<AutosuggestEmoji emoji={emoji} />);
+    const tree      = component.toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+});