public interface Delegate<T>

An empty interface to be used with the Expectations.result field or the Invocations#with(Delegate) method, allowing test code to freely define invocation results or argument matching rules, respectively.

The name and parameters of the delegate method must fit one of the following alternatives:

• A method matching the signature of the recorded method/constructor. That is, they should have the same name and parameters. In the case of delegating a constructor, a delegate method should still be used, with name "$init". In this case, the delegate class can have any number of additional methods.
• A single method with the same or a different name as the recorded method, but having the same parameters.
• A single method with the same or a different name, but having no parameters even if the recorded method/constructor has one or more of them. In this case, argument values passed during replay are simply ignored as far as the delegate is concerned.

Additionally, in any of the above three alternatives, the delegate method is allowed to declare an additional parameter of type Invocation. If said parameter is present, it must be the first one. At replay time, it will always receive a suitable object representing the associated invocation which happened to match the recorded expectation.

When used with the result field, the result of a delegate method execution can be any return value compatible with the recorded method's return type, or a thrown error/exception.

When used with the with method, the delegate method must return a boolean, being true for a successfully matched argument or false otherwise.

At replay time, when the mocked method/constructor is called the corresponding "delegate" method will be called. The arguments passed to the delegate method will be the same as those received by the recorded invocation during replay. Even static methods in the mocked type can have delegates, which in turn can be static or not. The same is true for private, final, and native methods.