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_parse_include():
    filepaths, current_line = mariofile.parse_include(INCLUDE_FILE.splitlines(True))
    assert filepaths == ['prova.ini', 'altrofile.ini']
    assert current_line == 4
    filepaths, current_line = mariofile.parse_include(INCLUDE_UNIQUE_FILE.splitlines(True))
    assert filepaths == ['prova.ini']
    assert current_line == 1