Mockito call a method on a parameter of a mocked method

Question

I am just starting with Mockito and I just want to do something like :

public class Test { public void clearList(List l){ doVeryLOOOONGDatabaseCallll(); l.clear(); return; } } /// ... Test test = mock(Test.class); Mockito.when(test.clearList(any(List.class))).then( l => l.clear());

Have some hint to do the trick? Thank you for your help!

No, I want to clear the list put in parameters when the method clearList(List l) is called. — Thomas
– Thomas, Commented May 29, 2013 at 16:51
Mock doVeryLOOOONGDatabaseCallll() not clearList(). Mocking isn't about changing behavior inside methods; it's making it so you don't need external dependencies. — Brian Roach
– Brian Roach, Commented May 29, 2013 at 16:54
Thank you Brian, but it is a static method, I just wanted to simplify the things. I can't mock it. — Thomas
– Thomas, Commented May 29, 2013 at 16:57

JB Nizet · Accepted Answer · 2013-05-29 16:56:42Z

Something like this should do it (not tested):

doAnswer(new Answer() { public Object answer(InvocationOnMock invocation) { Object[] args = invocation.getArguments(); List<?> list = (List<?>) args[0]; list.clear(); return null; } }).when(test).clearList(any(List.class));

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