mockito anyList of a given size

Question

I'm verifying with mockito that a method has been called. The method:

public void createButtons(final List<Button> buttonsConfiguration) {...} 

Since It doesn't matter which list is passed I verify that the method is called as follows:

verify(mock).createButtons(Matchers.anyListOf(Button.class)); 

But, the size of the List is important. So, it doesn't matter which List but the list has to have X elements.

Is that possible at all?

Answer 1

One way is to use a Captor

ArgumentCaptor<List> captor = ArgumentCaptor.forClass(List.class); verify(mock).createButtons(captor.capture()); assertEquals(x, captor.getValue().size()); // if expecting single list assertEquals(x, captor.getValues().size()); // if expecting multiple lists 

See http://docs.mockito.googlecode.com/hg/org/mockito/Mockito.html#15 for the documentation.

You could also use a custom argument matcher. The documentation shows an example that does exactly what you want:

http://docs.mockito.googlecode.com/hg/org/mockito/ArgumentMatcher.html

 class IsListOfTwoElements extends ArgumentMatcher<List> {      public boolean matches(Object list) {          return ((List) list).size() == 2;      }  }    List mock = mock(List.class);  when(mock.addAll(argThat(new IsListOfTwoElements()))).thenReturn(true);  mock.addAll(Arrays.asList("one", "two"));  verify(mock).addAll(argThat(new IsListOfTwoElements())); 

You could, for instance, also add a constructor so you can specify list size desired, etc.