Consider this:

Container container = new StatelessContainer(...);
Ejb3Registy.register(container);

boolean contains = Ejb3Registry.hasContainer(container);

The Ejb3Registry.hasContainer(...) is expected to return true, above. But it returns false.

Ejb3Registry.hasContainer() implementation tries to look into the containers map using a different key compared to what is being used to register the container in the Ejb3Registry.register implementation.