This test checks whether multi-root editor initializes correctly when DOM elements are passed in .create().

1. Click "Init editor".
2. Expected:

• Toolbar should be added in the first container.
• Three editable areas should be added in the second container.

3. Click "Destroy editor".
4. Expected:

• Editor should be destroyed.
• Toolbar should be removed.
• Editable areas should not be editable -- should be simple <div>s.
• The .ck-body region should be removed.