In my integration tests I want to replace a service by a fake implementation. For example I want to temporarily replace the event_dispatcher by a mock that will store all triggered events:

$container->set('event_dispatcher', $fakeDispatcher);

The problem is that event_dispatcher is an alias, and Container::get() first resolves aliases before trying to find the entry.

That makes Container::set() silently useless when setting an entry that is an alias.

IMO this is a bug, and I see 2 solutions (by order of preference), feel free to suggest alternatives:

• set() should erase any existing alias because it should just work
• set() should throw an exception if setting an alias

I can implement the solution if one is chosen.