Question

Is it possible to determine if an EasyMock mock is on replay mode?

Something like:

if (EasyMock.isReplayed(mock))
  // do something

Answer 1

In order to check the state of a mock you need to unProxy your mock and check the state set for that mock, and one state is the ReplayState. As EasyMock works with Java Proxies, this is quite easy:

EasyMock.replay(mock); // setting replay state to a mock object

// stripping proxy and getting the invocation handler
InvocationHandler invocationHandler = Proxy.getInvocationHandler(mock); 


// for easyMock, invocation handler holds the state of the mock 
ObjectMethodsFilter objectMethodsFilter = (ObjectMethodsFilter) invocationHandler; 

// not the not so elegant part:
// this: objectMethodsFilter.getDelegate().getControl().getState() 
// retrieves  the state instance that can be checked if it is an 
// instance of ReplayState.class
boolean inReplayState = objectMethodsFilter.getDelegate()
    .getControl().getState() instanceof ReplayState;

And thats it! This will print true because was already set to Replay

Maybe for version 3.1 you could use:

ClassExtensionHelper.getControl(mock).getState() instanceof ReplayState

ClassExtensionHelper.getControl() javadoc