PowerMockito: mocking private method and get a value without accessing it

Madhujith

I'm writing java unit test for a legacy code and I'm new to this area as well. I have to test following scenario (write unit test case for the testableMethod()). So, without executing code inside the getMode() method, I want to get a value for the mode variable.

Class A{

 public boolean testableMethod()
 {
   //code
   ......
   int mode = getMode();
   ......
   //do something with mode
   return X;
 }

 private int getMode()
 {
   return ComplexCalls(ComplexMethodCalls(), more());
 }

}

I've tried to do it using PowerMockito without getting success. It is possible to mock these kind of scenario with PowerMockito?.

gontard

You can with a PowerMockito spy:

public class A {
    public boolean testableMethod() {
        return getMode() == 1;
    }

    private int getMode() {
        return 5;
    }
}

import static org.junit.Assert.assertTrue;
import static org.powermock.api.mockito.PowerMockito.doReturn;
import static org.powermock.api.mockito.PowerMockito.spy;

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

@RunWith(PowerMockRunner.class)
@PrepareForTest(A.class)
public class ATest {
    @Test
    public void testableMethod_should_do_this() throws Exception {
        A a = spy(new A());

        doReturn(1).when(a, "getMode");

        assertTrue(a.testableMethod());
    }
}

See all this full example of partial mocking of a private method

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