I don't understand verifyZeroInteractions

[Federico Fissore]

Hi all

I think the code below must fail at "verifyZeroInteractions(collaborator)" but it does not. What am I getting wrong? (I'm using mockito 2.7.13)

package test;

import org.junit.Rule;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnit;
import org.mockito.junit.MockitoRule;
import org.mockito.quality.Strictness;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.Mockito.when;

public class MockitoTest {

   private static class Collaborator {

      public String doStuff(int number) {
         throw new RuntimeException();
      }

   }

   private static class Container {

      private final Collaborator collaborator;

      public Container(Collaborator collaborator) {
         this.collaborator = collaborator;
      }

      public String doStuff(int number) {
         return collaborator.doStuff(number);
      }

   }


   @Rule
   public MockitoRule rule = MockitoJUnit.rule().strictness(Strictness.STRICT_STUBS);

   @Mock
   private Collaborator collaborator;

   @Test
   public void testVerifyZeroInteractions() throws Exception {
      Container container = new Container(collaborator);
      when(collaborator.doStuff(42)).thenReturn("yeah");

      String output = container.doStuff(42);
      assertEquals("yeah", output);

      verifyZeroInteractions(collaborator);
   }
}

Regards

Federico

[Eric Lefevre-Ardant]

Well, do you get the RuntimeException sent by Collaborator.doStuff()? From reading your code, it seems that you would.

In that case, the test would fail before reaching the call to verifyZeroInteractions().

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[Federico Fissore]

I don't but that's expected. Collaborator.doStuff is stubbed

[Eric Lefevre-Ardant]

Sorry, you're right, I read wrong.

Not sure why it's not behaving as you expect, then :-\

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[Federico Fissore]

I've opened an issue with a more complete test case

https://github.com/mockito/mockito/issues/977