test_widgets.py 文件源码

def test_invoke(self):
        success = []
        def cb_test():
            success.append(1)
            return "cb test called"

        cbtn = ttk.Checkbutton(self.root, command=cb_test)
        # the variable automatically created by ttk.Checkbutton is actually
        # undefined till we invoke the Checkbutton
        self.assertEqual(cbtn.state(), ('alternate', ))
        self.assertRaises(tkinter.TclError, cbtn.tk.globalgetvar,
            cbtn['variable'])

        res = cbtn.invoke()
        self.assertEqual(res, "cb test called")
        self.assertEqual(cbtn['onvalue'],
            cbtn.tk.globalgetvar(cbtn['variable']))
        self.assertTrue(success)

        cbtn['command'] = ''
        res = cbtn.invoke()
        self.assertFalse(str(res))
        self.assertLessEqual(len(success), 1)
        self.assertEqual(cbtn['offvalue'],
            cbtn.tk.globalgetvar(cbtn['variable']))