fix: Move content into to frontend directory

Doing this BEFORE the merge prevents a lot of merge conflicts.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/src/components/common/user-avatar/user-avatar.test.tsx

@@ -0,0 +1,45 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { UserAvatar } from './user-avatar'
+import { render } from '@testing-library/react'
+import type { UserInfo } from '../../../api/users/types'
+import { mockI18n } from '../../markdown-renderer/test-utils/mock-i18n'
+
+describe('UserAvatar', () => {
+  const user: UserInfo = {
+    username: 'boatface',
+    displayName: 'Boaty McBoatFace',
+    photo: 'https://example.com/test.png'
+  }
+
+  beforeEach(async () => {
+    await mockI18n()
+  })
+
+  it('renders the user avatar correctly', () => {
+    const view = render(<UserAvatar user={user} />)
+    expect(view.container).toMatchSnapshot()
+  })
+  describe('renders the user avatar in size', () => {
+    it('sm', () => {
+      const view = render(<UserAvatar user={user} size={'sm'} />)
+      expect(view.container).toMatchSnapshot()
+    })
+    it('lg', () => {
+      const view = render(<UserAvatar user={user} size={'lg'} />)
+      expect(view.container).toMatchSnapshot()
+    })
+  })
+  it('adds additionalClasses props to wrapping span', () => {
+    const view = render(<UserAvatar user={user} additionalClasses={'testClass'} />)
+    expect(view.container).toMatchSnapshot()
+  })
+  it('does not show names if showName prop is false', () => {
+    const view = render(<UserAvatar user={user} showName={false} />)
+    expect(view.container).toMatchSnapshot()
+  })
+})