« HelloWorld v 2.0

Once upon a time we used to write:

public static void main(String[] args) {
   System.out.println("Hello World");
}

Now I prefer:

@Test
public void shouldSayHelloToTheGivenName() throws Exception {
        // given
        PrintStream mockStream = mock(PrintStream.class);      
        Greeter greeter = new Greeter(mockStream);
// when
    greeter.helloworld("toni");
// then
    verify(mockStream).println("Hello world, toni");
}

The test is of course using the beautiful test double framework Mockito