PowerMockito Mocking whenNew not taking effect

Question

Description:

I cannot seem to have my stubs or mocks take affect in the class I have under test. I am trying to use the whenNew action so I can mock a return object and then mock a operation on that object with a returned value.

I imagine its something simple I am missing but not seeing it.

SOLUTION: Originally I was running with MockitoRunner.class and it required being changed to PowerMockRunner.class. Code below reflects the solution.

Jars on the classpath:

• powermock-mockito-1.4.11-full.jar
• mockoito-all-1.9.0.jar
• javassist-3.15.0-GA.jar
• junit-4.8.2.jaf
• objensis-1.2.jar
• cglib-nodep-2.2.2.jar

TEST CLASS

   import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.powermock.api.mockito.PowerMockito;
    import static org.powermock.api.mockito.PowerMockito.*;
    import org.powermock.core.classloader.annotations.PrepareForTest;
    import org.powermock.modules.junit4.PowerMockRunner;
    import static org.mockito.Matchers.any;
    @RunWith(PowerMockRunner.class)
    @PrepareForTest(ClassA.class)
    public class ClassATest {

        @Test
        public void test() throws Exception
        {
                String[] returnSomeValue = {"PowerMockTest"};
                String[] inputValue = {"Test1"};
                ClassB mockedClassB = mock(ClassB.class);
                whenNew( ClassB.class).withNoArguments().thenReturn( mockedClassB );
                when( mockedClassB, "getResult", any(String[].class) ).thenReturn(returnSomeValue);       

                IClassA classUnderTest = new ClassA();
                String[] expectedValue = classUnderTest.runTest(inputValue);      
        }

    }

Class A Implementation

public class ClassA implements IClassA {

    @Override
    public String[] runTest(String[] inputValues) {

        String[] result;
        IClassB classB = new ClassB();
        result = classB.getResult(inputValues);

        return result;
    }

} 

Answer 1

Since you are using powermock features (@PrepareForTest, PowerMockito.whenNew etc.), you have to run your test with the PowerMockRunner.

@RunWith(PowerMockRunner.class)

Because ClassB#geResult is not private, you may also simplify your code and replace

when( mockedClassB, "getResult", any(String[].class) ).thenReturn(someValue); 

by

when(mockedClassB.getResult(any(String[].class))).thenReturn(someValue);