PowerMockDemo.java

public class PowerMockDemo {

  public void someMethod(String someArgument){
		
		ClassA a = new ClassA();
		ClassB b = new ClassB();

		ClassC c = new ClassC();
		c.setFirst(a);
		c.setSecond(b);
		c.execute(someArgument);
	}
	
}

PowerMockDemoTest.java

@RunWith(PowerMockRunner.class)
@PrepareForTest(PowerMockDemo.class)
public class PowerMockDemoTest {
  
	
	private PowerMockDemo toTest;
	

	@Test
	public void testExcuteMethod() throws Exception {
		
		toTest = new PowerMockDemo();
	
		// creates a new mock of ClassA
		ClassA mockA = createMock(ClassA.class);
		expectNew(ClassA.class).andReturn(mockA);
		
		// creates a new mock of ClassB
		ClassB mockB = createMock(ClassB.class);
		expectNew(ClassB.class).andReturn(mockB);
		
		
		// creates a new "strict" mock of ClassC
		ClassC mockC = createStrictMock(ClassC.class);
		expectNew(ClassC.class).andReturn(mockC);
		
		mockC.setFirst(mockA);
		expectLastCall().once();
		
		mockC.setSecond(mockB);
		expectLastCall().once();
		
		mockC.execute(EasyMock.anyObject(String.class));
		expectLastCall().once();
		
		replayAll();
		
		// run the test code
		toTest.someMethod("Hello PowerMock");
		
		verifyAll();
		
	}

}