Powermockito - FAQ

public class Example{
	public Example(){
		System.out.println("Default construsture");
	}
	public Example(int a){
		System.out.println("Construsture: " + a);
	}
}

@Test
public void test() throws Exception {
	Example example = PowerMockito.mock(Example.class);
 
	PowerMockito.whenNew(Example.class).withNoArguments().thenReturn(example);
	Example example1 = new Example();
	assertEquals(example, example1);
 
	PowerMockito.whenNew(Example.class).withAnyArguments().thenReturn(example);
	Example example2 = new Example(1);
	assertEquals(example, example2);
 
	PowerMockito.whenNew(Example.class).withArguments(Matchers.anyInt()).thenReturn(example);
	Example example3 = new Example(1);
	assertEquals(example, example3);
}

public  class Example{
	public Example(){
 
	}
	public void setData(String key, String aValue){
		// ...
	}
}

@Test
public void test() throws Exception {
	Example example = PowerMockito.mock(Example.class);
	PowerMockito.doNothing().when(example).setData(Matchers.same("test"), Matchers.anyString());
 
	example.setData("test", "123");
 
	Mockito.verify(example, Mockito.timeout(1)).setData(Matchers.same("test"), Matchers.anyString());
}