Question

I’m using the Mockito library for Java testing and getting errors in Mockito when I run my test. (I’m using the NetBeans IDE, in case that’s relevant). For example, I have a class called Animal and I am trying to perform the following simple test:

@Test
public void mokito_test(){

    Animal mockAnimal = mock(Animal.class);
    Animal testAnimal2 = mockAnimal;

    assertTrue(mockAnimal.equals(testAnimal2));

}

This test gives the following error:

mokito_test caused an ERROR (at org.mockito.internal.creation.jmock.ClassImposterizer.<init>(ClassImposterizer.java:37))
  at org.mockito.internal.creation.jmock.ClassImposterizer.<init>(ClassImposterizer.java:37)
  at org.mockito.internal.util.CreationValidator.validateType(CreationValidator.java:14)
  at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:33)
...etc.

(There are 11 more errors, including in java.net, java.security, java.lang, and sun.misc.)

However, if I perform this test using a real object instead of a mocked object, the test is successfull:

@Test
public void animal_test(){

    Animal testAnimal1 = new Animal("bear");
    Animal testAnimal2 = new Animal("bear");

    assertTrue(testAnimal1.equals(testAnimal2));

}

This test is successfull.

I have downloaded the Mockito jar file (mockito-core-1.8.0.jar) into my project directory, and then referencing the relative path of the jar file in the testing library for this particular project. I’ve never used Mockito before, so I suspect that my error has something to do with my system configuration. Any help would be greatly appreciated! Thanks!

Answer 1

Mockito has some external dependencies on objenesis and hamcrest libraryes, line 37 attempts to construct an object from objensis library.

Please use mockito-all-1.8.jar instead.