def test_groupbox_markup(manager):
    """Group labels can support markup but this is disabled by default."""
    no_markup = manager.c.widget["groupbox"]
    has_markup = manager.c.widget["has_markup"]

    # If markup is disabled, text will include markup tags so widget will be wider
    assert no_markup.info()["width"] > has_markup.info()["width"]
Group labels can support markup but this is disabled by default.
test/widgets/test_groupbox.py