Is it possible to do strict mocks with Mockito?

Question

I\'d like to use strict mocks, at least when developing for the first time some tests against old code, so any methods invoked on my mock will throw an exception if I didn\'t sp

Answer 1

You could use verifyNoMoreInteractions. It's useful if the tested class catches exceptions.

@Test
public void testVerifyNoMoreInteractions() throws Exception {
    final MyInterface mock = Mockito.mock(MyInterface.class);

    new MyObject().doSomething(mock);

    verifyNoMoreInteractions(mock); // throws exception
}

private static class MyObject {
    public void doSomething(final MyInterface myInterface) {
        try {
            myInterface.doSomethingElse();
        } catch (Exception e) {
            // ignored
        }
    }
}

private static interface MyInterface {
    void doSomethingElse();
}

Result:

org.mockito.exceptions.verification.NoInteractionsWanted: 
No interactions wanted here:
-> at hu.palacsint.CatchTest.testVerifyNoMoreInteractions(CatchTest.java:18)
But found this interaction:
-> at hu.palacsint.CatchTest$MyObject.doSomething(CatchTest.java:24)
Actually, above is the only interaction with this mock.
    at hu.palacsint.stackoverflow.y2013.q8003278.CatchTest.testVerifyNoMoreInteractions(CatchTest.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    ...