Using makeWith in combination with mocking

In my code I'm using makeWith to resolve dependencies. In my tests I'm creating a mock that should be resolved in the code by calling the makeWith. However it's not the case.

App::make('App\Item'); //ok: returns mock
App::makeWith('App\Item', ['name' => 'apple'];//not ok: doesn't return the mock but the class to be used outside the test environment

Is this a bug or am I missing something?