@Test public void getMessage_ShouldReturnMessage() { assertEquals("Hello World!", messageService.getMessage()); }
public String getMessage() { return "Hello World!"; }
MessageService { public String getMessage() { return "Hello World!"; } }
MessageService { public String getMessage() { return "Hello World!"; }  }
MessageService { public String getMessage() { return "Hello World!"; }  String getMessage(); }
MessageService { public String getMessage() { return "Hello World!"; }  String getMessage();  }