test: Add tests

Author: Xiaokang2022

Lib/test/test_tkinter/test_widgets.py

@@ -354,6 +354,9 @@ def test_bad_kwarg(self):
         with self.assertRaisesRegex(TclError, r"^unknown option -image$"):
             tkinter.OptionMenu(self.root, None, 'b', image='')
 
+    def test_default_parameters(self):
+        tkinter.OptionMenu(self.root)
+
 @add_configure_tests(IntegerSizeTests, StandardOptionsTests)
 class EntryTest(AbstractWidgetTest, unittest.TestCase):
     _rounds_pixels = (tk_version < (9, 0))