Matching an array of Objects using Mockito

Question

I'm trying to set up a mock for a method that takes an array of Request objects:

client.batchCall(Request[])

I've tried these two variations:

when(clientMock.batchCall(any(Request[].class))).thenReturn(result);
...
verify(clientMock).batchCall(any(Request[].class));

and

when(clientMock.batchCall((Request[])anyObject())).thenReturn(result);
...
verify(clientMock).batchCall((Request[])anyObject());

But I can tell the mocks aren't being invoked.

They both result in the following error:

Argument(s) are different! Wanted:
clientMock.batchCall(
    <any>
);
-> at com.my.pkg.MyUnitTest.call_test(MyUnitTest.java:95)
Actual invocation has different arguments:
clientMock.batchCall(
    {Request id:123},
    {Request id:456}
);

Why does the matcher not match the array? Is there a special matcher I need to use to match an array of objects? The closest thing I can find is AdditionalMatches.aryEq(), but that requires that I specify the exact contents of the array, which I'd rather not do.

Answer 1

So I quickly put something together to see if I could find your issue, and can't below is my sample code using the any(Class) matcher and it worked. So there is something we are not seeing.

Test case

@RunWith(MockitoJUnitRunner.class)
public class ClientTest
{
    @Test
    public void test()
    {
        Client client = Mockito.mock(Client.class);

        Mockito.when(client.batchCall(Mockito.any(Request[].class))).thenReturn("");

        Request[] requests = {
            new Request(), new Request()};

        Assert.assertEquals("", client.batchCall(requests));
        Mockito.verify(client, Mockito.times(1)).batchCall(Mockito.any(Request[].class));
    }
}

client class

public class Client
{
    public String batchCall(Request[] args)
    {
        return "";
    }
}

Request Class

public class Request
{

}