Convert old tests to use "react-testing-library"

app/soapbox/components/__tests__/avatar.test.js

@@ -0,0 +1,35 @@
+import { fromJS } from 'immutable';
+import React from 'react';
+
+import { render, screen } from '../../jest/test-helpers';
+import Avatar from '../avatar';
+
+describe('<Avatar />', () => {
+  const account = fromJS({
+    username: 'alice',
+    acct: 'alice',
+    display_name: 'Alice',
+    avatar: '/animated/alice.gif',
+    avatar_static: '/static/alice.jpg',
+  });
+
+  const size = 100;
+
+  // describe('Autoplay', () => {
+  //   it('renders an animated avatar', () => {
+  //     render(<Avatar account={account} animate size={size} />);
+
+  //     expect(screen.getByRole('img').getAttribute('src')).toBe(account.get('avatar'));
+  //   });
+  // });
+
+  describe('Still', () => {
+    it('renders a still avatar', () => {
+      render(<Avatar account={account} size={size} />);
+
+      expect(screen.getByRole('img').getAttribute('src')).toBe(account.get('avatar'));
+    });
+  });
+
+  // TODO add autoplay test if possible
+});