def METHOD_NAME(self):
    self.load_phase('pt.jcpds')
    self.model.phase_model.set_pressure(0, 100)
    first_line_position = self.widget.pattern_widget.phases[0].line_items[0].getData()[0][0]
    self.model.phase_model.set_temperature(0, 3000)
    self.assertNotEqual(first_line_position,
                        self.widget.pattern_widget.phases[0].line_items[0].getData()[0][0])