Powermock mockstatic Cannot subclass final class

Question

I am trying to mock a final class

PowerMockito.mockStatic(TestFinalClass.class);

It is working from my eclipse when I run a single junit and ad

Answer 1

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(FinalClass.class)
public class TestFinalClass{

    @Test
    public void whenMockFinalClassMockWorks() {

        FinalClass finalklass = PowerMockito.mock(FinalClass.class);
    }
}

Answer 2

package test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(FinalClass.class)
public class Tests {
    @Test
    public void test() {
    PowerMockito.mockStatic(FinalClass.class);
    }
}

This works for me. If you add 'PowerMockRunner' and 'PrepareForTest' annotations you don`t need to use extra vm arguments.

Answer 3

I got the code coverage using JaCoCo and need to make some changes related to it in the test class code. Those are as below:

1. I removed @RunWith annotation

2. Added @Rule and PowerMockRule class

3. Mentioned the Final and Static class in @PrepareForTest

   @PrepareForTest(FinalClass.class, StaticClass.class)

   public class Tests {

   @Rule
   public PowerMockRule rule = new PowerMockRule();
   
   @Test
   public void test() {
       PowerMockito.mockStatic(FinalClass.class);
       PowerMockito.mockStatic(StaticClass.class);
   }
   

   }

Also added the argline in surefire to overcome the final class problem while mocking.

<configuration>
                <argLine>-javaagent:{path}/powermock-module-javaagent-1.6.4.jar</argLine>
            </configuration>