Classcast exception when using mockito

Question

I am getting classcast exception using the following bit of code in Test case.

  Employee employee1= new Employee();
  Employee employee2= new Employee();
  Employee employee3= new Employee();
  int id=1234;

  when(employee1.getID()).thenReturn(id);
  when(employee2.getID()).thenReturn(id);
  when(employee3.getID()).thenReturn(id);

I want to generalize this as

 when((((Employee)Matchers.any(Employee.class)).getID())).thenReturn(id);

Am I doing anything wrong?

java.lang.ClassCastException: org.hamcrest.core.IsInstanceOf cannot be cast to com.site.model.Employee

Nikos T · Accepted Answer · 2018-10-10 10:25:34Z

3

Hi I know this is a very old question however I just got to this same problem myself today.

Anyway it has to do with how hamcrest handles Matchers. I basically doesn't return the given type but a wrapper around it.

The easiest way to fix it is to use any from mockito not hamcrest e.g.

when((((Employee)org.mockito.Matchers.any(Employee.class)).getID())).thenReturn(id);

For more details see this answer: comparison with mockito and hamcrest matchers

Hope it helps anyone stumbling through this ;)

answered Oct 10, 2018 at 10:25

Nikos T

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1 Comment

jumping_monkey Over a year ago

Cool answer! The only change is to use org.mockito.ArgumentMatchers.any as org.mockito.Matchers.any is deprecated.

Steve C · Accepted Answer · 2014-08-04 14:31:29Z

1

If you find that you need to typecast when using Mockito then you usually have something wrong.

I guess you are trying to do something like:

    Employee employee = Mockito.mock(Employee.class);
    when(employee.getId()).thenReturn(id);

answered Aug 4, 2014 at 14:31

Steve C

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5 Comments

Patan Over a year ago

Here employee is not fixed. I need to return same thing for the instance employee1 or employee2. Can you suggest how to do that

Steve C Over a year ago

You should show more of your test code so that we can get some context

Patan Over a year ago

Sorry for limited information. I have updated the question. Can you help me.

Steve C Over a year ago

What piece of logic are you trying to test?

Patan Over a year ago

It shall be independent of logic. I just need to return a constant value when the method is being invoked for all test cases.

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