def METHOD_NAME():
    def test(a=3.1):
        return a
    interact_pane = interactive(test, a=(0, 4, 0.1))
    widget = interact_pane._widgets['a']
    assert isinstance(widget, widgets.FloatSlider)
    assert widget.value == 3.1
    assert widget.start == 0
    assert widget.step == 0.1
    assert widget.end == 4