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POSetting up a Mockery's Expectations in relation to protected methods
 

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  1. POSetting up a Mockery's Expectations in relation to protected methods
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    <p>I'm running into a problem with trying to set up a Mockery to test for method invocation. I saw <a href="https://stackoverflow.com/questions/8375541/how-to-test-protected-methods-of-abstract-class-using-junit-and-jmock">How to test protected methods of abstract class using JUnit and JMock</a> and it's essentially the same question, but I can't make out what Chris is referring to in his answer. If I could please have someone explain it to me in a slightly different way or with more complete English. I'm using JUnit, JMock2, Infinitest (if that matters), and a standard event-based message system as follows:</p> <pre><code>public Interface MyEventListener { void handleMyEvent(MyEvent e); } public Class MyEvent extends EventObject { public MyEvent(Object source) { super(source); } } public Class MySource { protected List&lt;MyEventListener&gt; listeners = new ArrayList&lt;MyEventListeners&gt;(); public void addListener(MyEventListener listener) { listeners.add(listener); } public void removeListener(MyEventListener listener) { listeners.remove(listener); } // other code... protected void raiseEvent() { for (MyEventListener listener : listeners) { listener.handleMyEvent(new MyEvent(this)); } } } </code></pre> <p>Now here's my test:</p> <pre><code>@Test public void sourceShouldThrowEventOnEventOccurrence() { // set up Mockery context = new Mockery(); MyEventListener listener = context.mock(MyEventListener.class); MySource source = new MySource(); MyEvent event = new MyEvent(source); source.addListener(listener); // set expectations context.checking(new Expectations() {{ oneOf(listener).handleMyEvent(event); }}); // execute // do stuff to (theoretically) raise event // verify context.assertIsSatisfied(); } </code></pre> <p>I get an ExpectationError (unexpected invocation) on my protected method of raiseEvent() in MySource. How can I add to the expectation that it should call the protected method?</p> <p>Also, a thought just occurred to me - but I'm still posting this message before I go explore it (in case someone else has the same question and my thought ends up being right or not). Could the error possibly be related to the fact that I have two new keywords in my code? I have new MyEvent(this) in MySource.raiseEvent() and then I have new MyEvent(source) in the test. This creates two different events in memory... Is the error related to the possibility that it expects the method to get one event, but receives the other?</p> <p>*****EDIT</p> <p>Actually, specifically, I get an ExpectationError (unexpected invocation) on the line of code that actually raises the events. (In my code above, the <code>listener.handleMyEvent(new MyEvent(this));</code> line)</p>
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    1. USJoishi Bodio
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    1. COtry mocking the class rather than interface `context.mock(MySource.class);`
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      1. POSetting up a Mockery's Expectations in relation to protected methods
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    2. COI tried mocking the event before I made my post and it said that I could only mock instances. I read about mocking classes (which is capable if you add `setImposteriser(ClassImposteriser.INSTANCE);` to the mockery creation. I'm relatively new to TDD, but that doesn't SEEM like the correct approach here. But I'll give it a try. I don't want to mock the source, btw, since that's the object under test.
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      1. POSetting up a Mockery's Expectations in relation to protected methods
      1. USJoishi Bodio
    3. COAlso, when I alter what I have to make the handleMyEvent() method visible, it then says that I can only set expectations on mock events.. So then I'm confused as to why it's complaining that something was unEXPECTEDLY invocated in a non-mocked object.
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      1. USJoishi Bodio
 

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