bpo-37099: Silence DeprecationWarning in test_inspect (GH-13679)

Fix DeprecationWarning introduced in aee19f54


https://bugs.python.org/issue37099

Lib/test/test_inspect.py

@@ -750,12 +750,14 @@ class TestClassesAndFunctions(unittest.TestCase):
 
     def assertArgSpecEquals(self, routine, args_e, varargs_e=None,
                             varkw_e=None, defaults_e=None, formatted=None):
+        with self.assertWarns(DeprecationWarning):
             args, varargs, varkw, defaults = inspect.getargspec(routine)
         self.assertEqual(args, args_e)
         self.assertEqual(varargs, varargs_e)
         self.assertEqual(varkw, varkw_e)
         self.assertEqual(defaults, defaults_e)
         if formatted is not None:
+            with self.assertWarns(DeprecationWarning):
                 self.assertEqual(inspect.formatargspec(args, varargs, varkw, defaults),
                                  formatted)
 
@@ -774,6 +776,7 @@ class TestClassesAndFunctions(unittest.TestCase):
         self.assertEqual(kwonlydefaults, kwonlydefaults_e)
         self.assertEqual(ann, ann_e)
         if formatted is not None:
+            with self.assertWarns(DeprecationWarning):
                 self.assertEqual(inspect.formatargspec(args, varargs, varkw, defaults,
                                                        kwonlyargs, kwonlydefaults, ann),
                                  formatted)