Mockito - how to verify that a mock was never invoked

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I'm looking for a way to verify with Mockito, that there wasn't any interaction with a given mock during a test. It's easy to achieve that for a given method with verification mode never(), but I haven't found a solution for the complete mock yet.

What I actually want to achieve: verify in tests, that nothing get's printed to the console. The general idea with jUnit goes like that:

private PrintStream systemOut;

@Before
public void setUp() {
    // spy on System.out
    systemOut = spy(System.out);
}

@After
public void tearDown() {
    verify(systemOut, never());  // <-- that doesn't work, just shows the intention
}

A PrintStream has tons of methods and I really don't want to verify each and every one with separate verify - and the same for System.err...

So I hope, if there's an easy solution, that I can, given that I have a good test coverage, force the software engineers (and myself) to remove their (my) debug code like System.out.println("Breakpoint#1"); or e.printStacktrace(); prior to committing changes.

mockito junit java
5 Answers

Since the original correct answer, verifyZeroInteractions has been deprecated, use verifyNoInteractions instead:

import org.junit.jupiter.api.Test;

import static org.mockito.Mockito.*;

public class SOExample {

    @Test
    public void test() {
        Object mock = mock(Object.class);
        verifyNoInteractions(mock);
    }
}
user_35060000
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