def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def test_cnli_caps_on(fake_qtile, patched_cnli, fake_window):
    widget = patched_cnli.CapsNumLockIndicator()

    # Simulate Caps on
    MockCapsNumLockIndicator.index = 1

    fakebar = FakeBar([widget], window=fake_window)
    widget._configure(fake_qtile, fakebar)
    text = widget.poll()

    assert text == "Caps on Num on"