Sample test case:
- In "Project Explorer" select Import from context menu
- Select "General\Existing Projects Into Workspace"
- Set root directory, select project and check "Copy projects into workspace" checkbox
- Press "Finish" button
- Make sure that project was imported. But verification that files and folders were copied cannot be added.
In this particular case it is possible to make sure the exact location of resource, but currently it is impossible to assert the absence of file at given path