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 on_btn_add_fuzzing_values_clicked(self):
        if self.ui.comboBoxStrategy.currentIndex() == 0:
            self.__add_fuzzing_range()
        elif self.ui.comboBoxStrategy.currentIndex() == 1:
            self.__add_fuzzing_boundaries()
        elif self.ui.comboBoxStrategy.currentIndex() == 2:
            self.__add_random_fuzzing_values()