def test_that_slow_displays_trigger_render_processing(mocker):
widget = Labeller(display_func=lambda _: time.sleep(0.6))
mock_processing = mocker.patch.object(widget, "_render_processing")
widget._display("dummy feature")
assert mock_processing.call_count == 0
widget._display("dummy feature")
assert mock_processing.call_count == 1
def test_that_display_calls_display_func(mocker):
mock_display = mocker.Mock()
widget = Labeller(display_func=mock_display, input_widget=Submitter())
widget._display("dummy feature")
assert mock_display.call_count == 1