import static org.junit.Assert.assertEquals; import org.junit.Test; import org.junit.runner.RunWith; import org.powermock.api.mockito.PowerMockito; import org.powermock.api.support.membermodification.MemberModifier; import org.powermock.core.classloader.annotations.PrepareForTest; import org.powermock.modules.junit4.PowerMockRunner; @RunWith(PowerMockRunner.class) @PrepareForTest({ MyClass.class }) public class MyClassTest { @Test public void testPrivateMethod() throws Exception { MyClass myClass = PowerMockito.mock(MyClass.class); PowerMockito.when(myClass, "privateMethod").thenReturn("Mocked Value"); String result = myClass.callPrivateMethod(); assertEquals("Mocked Value", result); } }