Mocking a Spy method with Mockito

Question

I am writing a unit test for a FizzConfigurator class that looks like:

public class FizzConfigurator {
    public void doFoo(String msg) {
        d         


        

Answer 1

In my case, for the method I was trying to stub, I was passing in incorrect matchers.

My method signature (for the super class method I was trying to stub): String, Object.

I was passing in:

myMethod("string", Mockito.nullable(ClassType.class)) and getting:

Hints: 1. missing thenReturn() 2. you are trying to stub a final method, which is not supported 3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed

When using a matcher in another parameter, we also need to use one for the string:

myMethod(eq("string"), Mockito.nullable(ClassType.class))

Hope this helps!

Answer 2

I wouldn't use exceptions to test that, but verifications. And another problem is that you can't use when() with methods returning void.

Here's how I would do it:

FizzConfigurator fixture = Mockito.spy(new FizzConfigurator());
doNothing().when(fixture).doWidget(Mockito.anyString(), Mockito.<Config>any()));
fixture.doBuzz("some string");
Mockito.verify(fixture).doWidget("some string", Config.SOMETIMES);

Answer 3

This is a clear sign that doWidget method should belong to another class which FizzConfigurator would depend on.

In your test, this new dependency would be a mock, and you could easily verify if its method was called with verify.