def main(): app = wx.App() rootframe = wx.Frame(None) viewer = SingletViewer(rootframe) hdulist = fits.open(context.get_test_data_path(TEST_FILE)) fits_image = Mock() fits_image.as_hdulist.return_value = hdulist viewer.display(fits_image) viewer.draw_marker(50, 50, 10) viewer.draw_marker(20, 70, 5) rootframe.Show() app.MainLoop()