Test multiple markdown extensions (#1886)

This commit adds multiple unit jest tests for components and removes e2e tests. 

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

Signed-off-by: Philip Molares <philip.molares@udo.edu>

Co-authored-by: Philip Molares <philip.molares@udo.edu>

src/components/markdown-renderer/markdown-extension/vimeo/vimeo-frame.test.tsx

@@ -0,0 +1,23 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { render } from '@testing-library/react'
+import { VimeoFrame } from './vimeo-frame'
+import React from 'react'
+import type { ClickShieldProps } from '../../replace-components/click-shield/click-shield'
+import * as ClickShieldModule from '../../replace-components/click-shield/click-shield'
+
+describe('VimeoFrame', () => {
+  beforeEach(() => {
+    jest.spyOn(ClickShieldModule, 'ClickShield').mockImplementation((({ children }) => {
+      return <span>This is a click shield for {children}</span>
+    }) as React.FC<ClickShieldProps>)
+  })
+
+  it('renders a click shield', () => {
+    const view = render(<VimeoFrame id={'valid vimeo id'} />)
+    expect(view.container).toMatchSnapshot()
+  })
+})