Question

I am beginning with mockito and wondering how to fake adding an observer. I want to write a test that ensures that the observer count has increased after a function call.

example testing code:

MyClassUnderTest instance = new MyClassUnderTest();
AudioDeviceManager adm = mock(AudioDeviceManager.class);

assertEquals(adm.countObservers(), 0);

instance.setup(adm, microphone);
//Inside the setup function, microphone is added as an observer 
//to the device manager: adm.addObserver(microphone);

assertEquals(adm.countObservers(), 1);

Since adm is a mock, I know I have to define the logic of addObserver but I do not know what to –
when(adm.addObserver(Observer o)).then(?)

Answer 1

brian,

use verify. For example instead of the assert, run

verify(adm).countObservers( AnyObject)

and check the first chapter of http://mockito.googlecode.com/svn/branches/1.5/javadoc/org/mockito/Mockito.html

Cheers,
a.