Mockito: how to use a parameter of a mocked function?

Question

I'm using Mockito and would like to do something like:

Mockito.doReturn(new MyObject(capturedParameter)) . when(mockedCreatorInstance).findByParameter(anyString())

So when someone calls the method mockedCreatorInstance.findByParameter("XXXX"), the value returned would be new MyObject("XXXX").

As you can see, the mocked method signature of mockedCreatorInstance, would be

MyObject findByParameter(String parameter);

I tried something using ArgumentCaptor<String> but failed.

What should I do to make it work?

"I tried something using ArgumentCaptor<String> but failed." Please show what you tried, and describe in what way it failed. — Andy Turner
– Andy Turner, Commented Jun 2, 2017 at 22:45

Andrew Shelansky · Accepted Answer · 2017-06-08 05:51:52Z

The Mockito documentation recommends against using ArgumentCaptor<>s when stubbing rather than verifying.

I believe you can achieve what you want with an Answer:

when(mockedCreatorInstance.findByParameter(anyString())) .thenAnswer(new Answer<MyObject>() { public MyObject answer(InvocationOnMock invocation) { Object[] args = invocation.getArguments(); return new MyObject((String) args[0]); }});

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