Unit testing a Swing component

Question

I am writing a TotalCommander-like application. I have a separate component for file list, and a model for it. Model support listeners and issues a notification for events like

Answer 1

I've only been working with jMock for two days... so please excuse me if there is a more elegant solution. :)

It seems like your FileTableModel depends on SwingUtilities... have you considered mocking the SwingUtilities that you use? One way that smells like a hack but would solve the problem would be to create an interface, say ISwingUtilities, and implement a dummy class MySwingUtilities that simply forwards to the real SwingUtilities. And then in your test case you can mock up the interface and return true for isEventDispatchThread.

@Test
public void testEventsNow() throws IOException {
    IFile testDir = mockDirectoryStructure();

    final ISwingUtilities swingUtils = context.mock( ISwingUtilities.class );

    final FileSystemEventsListener listener = 
                context.mock(FileSystemEventsListener.class);

    context.checking(new Expectations()
    {{
        oneOf( swingUtils ).isEventDispatchThread();
            will( returnValue( true ) );

        oneOf(listener).currentDirectoryChanged(with(any(IFile.class)));
    }});

    FileTableModel model = new FileTableModel(testDir);
    model.setSwingUtilities( swingUtils ); // or use constructor injection if you prefer
    model.switchToInnerDirectory(1);
}