JMockit Mocks Are Not Being Created

[opticyclic]

I took the code example from here https://stackoverflow.com/questions/14375854/jmockit-and-fest-ui-testing and put it in a gradle project here https://github.com/opticyclic/assertj-swing-mocks

The test code inside the GuiActionRunner doesn't seem to get mocked even though the code outside it does.

  @Override
  protected void onSetUp() {
    //Mock the Service
    new Expectations() {{
      service.getValue();
      result = mockText;
    }};

    //Demonstrate that the mocking is working here
    SimpleService simpleService = new SimpleService();
    Assert.assertEquals(simpleService.getValue(), mockText);

    JFrame frame = GuiActionRunner.execute(new GuiQuery<JFrame>() {
      @Override
      protected JFrame executeInEDT() {
        SimpleController controller = new SimpleController();

        JFrame frame = new JFrame("Simple Frame");
        frame.add(controller.getPanel());
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        frame.pack();
        return frame;
      }
    });

The test fails with:

java.lang.AssertionError: [javax.swing.JButton[name='testButton', text='Not Mocked', enabled=true, visible=true, showing=true] - property:'text'] 
Expecting:
 "Not Mocked"
to match pattern:
 "Mock Button Text"

Why are the mocks not being created?