Question

I am creating a general general mock-client for testing HTTP-interactions. For this, I would like to be able to make a number of responses of the same method.
With a normal mock, this would not be a problem:

when(mock.execute(any(), any(), any())).thenReturn(firstResponse, otherResponses)

However, I am using a partial mock, where I simply want to mock method making the HTTP request, since there might not be access to a live end-point or the Internet in general for that matter in the context where the unit-tests are executed.

So I will be doing something like:

doReturn(response).when(spy).execute(hostCaptor.capture(), requestCaptor.capture(), contextCaptor.capture());

However, I would like to be able to support more than one response (not much of an “interaction”). But there are no doReturn-method, which takes a more than a single response at a time.

My first attempt on a solution was to do it iteratively:

Stubber stubber = null;
for (HttpResponse response : responses) {
    if (stubber == null) {
        stubber = doReturn(response);
    } else {
        stubber = stubber.doReturn(response);
    }
}
stubber.when(spy).execute(hostCaptor.capture(), requestCaptor.capture(), contextCaptor.capture());

This does however fail to verify (“Unfinished stubbing detected”) when running the test.

So – is there a way to achieve this with Mockito?

Thanks for reading.

Answer 1

You can write

doReturn( 1 ).doReturn( 2 ).doReturn( 3 ).when( myMock ).myMethod( any(), any(), any());

Edit:

If the values you want are in the array myArray, then you could also use

import static java.util.Arrays.asList;
import static org.mockito.Mockito.doAnswer;
import org.mockito.stubbing.answers.ReturnElementsOf

....

doAnswer( new ReturnsElementsOf( asList( myArray )))
   .when( myMock ).myMethod( any(), any(), any());