Mockito: Verifying with generic parameters

Question

With Mockito I can do the following:

verify(someService).process(any(Person.class));

But how do I write this if process takes a Collection<Person> instead? Can't figure out how to write it correctly. Just getting syntax errors...

Answer 1

Try :

verify(someService).process(anyCollectionOf(Person.class));

Since version 1.8 Mockito introduces

public static <T> Collection<T> anyCollectionOf(Class<T> clazz);

Answer 2

You can't express this because of type erasure. Even if you could express it in code, Mockito had no chance to check it at runtime. You could create an interface like

interface PersonCollection extends Collection<Person> { /* nothing */ }

instead and use this throughout your code.

Edit: I was wrong, Mockito has anyCollectionOf(..) which is what you want.

Answer 3

if you use a own method, you can even use static import:

private Collection<Person> anyPersonCollection() {
    return any();
}

Then you can use

verify(someService).process(anyPersonCollection());

Answer 4

Try:

verify(someService).process(Matchers.<Collection<Person>>any());

Actually, IntelliJ automatically suggested this fix when I typed any()... Unfortunately you cannot use static import in this case.