def METHOD_NAME(qtbot):
    """If you supply a valid filename argument, you shouldn't get any exceptions."""
    my_display = Display(parent=None, ui_filename=test_ui_path)
    qtbot.addWidget(my_display)
    css = "PyDMLabel { font-weight: bold; }"
    my_display.setStyleSheet(css)
    assert my_display.styleSheet() == css