How to capture variable parameters with Mockito?

Question

There is a method which has variable parameters:

class A { public void setNames(String... names) {} }

Now I want to mock it with mockito, and capture the names passed to it. But I can't find a way to capture any number of names passed, I can only get them like this:

ArgumentCaptor<String> captor1 = ArgumentCaptor.fromClass(String.class); ArgumentCaptor<String> captor2 = ArgumentCaptor.fromClass(String.class); A mock = Mockito.mock(A.class); mock.setNames("Jeff", "Mike"); Mockito.verity(mock).setNames(captor1.capture(), captor2.capture()); String name1 = captor1.getValue(); // Jeff String name2 = captor2.getValue(); // Mike

If I pass three names, it won't work, and I have to define a captor3 to capture the 3rd name.

How to fix it?

sudeep · Accepted Answer · 2015-09-11 15:23:22Z

Mockito 1.10.5 has introduced this feature.

For the code sample in the question, here is one way to capture the varargs:

 ArgumentCaptor<String> varArgs = ArgumentCaptor.forClass(String.class); A mock = Mockito.mock(A.class); mock.setNames("Jeff", "Mike", "John"); Mockito.verify(mock).setNames(varArgs.capture()); //Results may be validated thus: List<String> expected = Arrays.asList("Jeff", "Mike", "John"); assertEquals(expected, varArgs.getAllValues());

Please see the ArgumentCaptor javadoc for details.

Do you happen to know whether this works with subclasses? E.g. String.format(String fromat, Object ... args) and invokation with instances of different types (yeah, I know String is final, it's just an example)?
@nachteil Yes, ArgumentCaptor<T> can capture all subclass instances of T. e.g., use ArgumentCaptor<Object> to capture all types of objects. Please note, a static method like String.format() cannot be mocked or spied upon with Mockito. Please see this answer for details.
Is it possible to capture instance variable or local variable in junit ?

Jeff Bowman · Accepted Answer · 2013-11-08 05:18:10Z

As of today (7 Nov 2013) it appears to be addressed, but unreleased, with a bit of additional work needed. See the groups thread and issue tracker for details.

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