I modified the Publisher/Subscriber example to reject duplicate subscriber
instances. It ran and passed the test that I had created. I then added the
following test to show that three different subscribers would each receive
the message once, when piblished:

 @Test
 public void testPublish3()
 {
   // Set up test.
   final Publisher publisher = new Publisher();
   final Subscriber subscriber1 = context.mock(Subscriber.class);
   final Subscriber subscriber2 = context.mock(Subscriber.class);
   final Subscriber subscriber3 = context.mock(Subscriber.class);
   publisher.add(subscriber1);
   publisher.add(subscriber2);
   publisher.add(subscriber3);
   final String message = "message";

   // Set up expectations.
   context.checking(new Expectations() {{
     exactly(1).of(subscriber1).receive(message);
     exactly(1).of(subscriber2).receive(message);
     exactly(1).of(subscriber3).receive(message);
   }});

   // Execute action.
   publisher.publish(message);

   // Verify results.
   context.assertIsSatisfied();
 }

This compiles fine but the test crashed with the following error:

java.lang.IllegalArgumentException: a mock with name subscriber already
exists
 at org.jmock.Mockery.mock(Mockery.java:128)
 at org.jmock.Mockery.mock(Mockery.java:120)
 at jmock.PublisherTest.testPublish3(PublisherTest.java:61) (i.e. where
subscriber2 is declared, above).

How should I have written this test?

Thanks,
Vince.

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