Mockito Scala overloaded method value thenReturn with alternatives

Question

I am new to Scala and am writing some tests for Play app in Scala. The Play app has already been written in Java.

I have a RefreshService that has one public method process

public RefreshResponse process(RefreshRequest request) throws Exception {
    return this.oauthService.token(request.oauthUrl, request.clientId, request.clientSecret, request.refreshToken)
        .thenCompose(oauthToken -> this.processHelper(request.withOAuthToken(oauthToken)))
        .get();
}

Where actions are defined in another package as a POJOs

I have written my tests based on the Scala guides

When trying to mock this service I used the following code

var mockRefreshService = mock[RefreshService]
when(mockRefreshService.process(_: RefreshRequest)) 
    thenReturn (new RefreshResponse)

I get the following compiler error from Scala and cannot figure out how the types can be ambigous

[error] /home/joey/Projects/sntdb/test/controllers/ApiControllerSpec.scala:31: overloaded method value thenReturn with alternatives:

[error] (x$1: actions.RefreshRequest => actions.RefreshResponse,x$2: actions.RefreshRequest => actions.RefreshResponse*)org.mockito.stubbing.OngoingStubbing[actions.RefreshRequest => actions.RefreshResponse]

[error] (x$1: actions.RefreshRequest => actions.RefreshResponse)org.mockito.stubbing.OngoingStubbing[actions.RefreshRequest => actions.RefreshResponse]

[error] cannot be applied to (actions.RefreshResponse)

[error] when(mockRefreshService.process(_: RefreshRequest)) thenReturn (new RefreshResponse)

If anymore information is needed please let me know. Otherwise if anyone has any ideas it would be appreciated.

Bruno Bruno · Accepted Answer · 2018-08-02T20:15:46

If you use mockito-scala you can mix-in the trait org.mockito.ArgumentMatchersSugar and it will provide all the appropriate ones, furthermore, for any you don't need to specify the type anymore as the compiler will figure it out

Check https://github.com/mockito/mockito-scala for more info

Disclaimer: I develop that library (but is part of the mockito suite anyway)

Mockito Scala overloaded method value thenReturn with alternatives

2 Answers