@Test
public void singletonTest() {
// create singleton instances
final Singleton singleton1 = Singleton.getInstance();
final Singleton singleton2 = Singleton.getInstance();
final Singleton singleton3 = Singleton.getInstance();
// assert that the random number is the same thereby
// ensuring we are dealing with a single object instance
final int rand = singleton1.getRand();
assertEquals(rand, singleton2.getRand());
assertEquals(rand, singleton3.getRand());
// set a string message on a singleton
final String message = "Singleton2 message";
singleton2.setMessage(message);
// read the string message from the singletons
assertEquals(message, singleton1.getMessage());
assertEquals(message, singleton3.getMessage());
}
