Write a test case for deprecationwarning

Author: srinivasreddy

Lib/test/test_sys.py

@@ -850,7 +850,12 @@ def test_sys_getwindowsversion_no_instantiation(self):
 
     @test.support.cpython_only
     def test_clear_type_cache(self):
-        sys._clear_type_cache()
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            sys._clear_type_cache()
+            self.assertEqual(len(w), 1)
+            self.assertTrue(issubclass(w[0].category, DeprecationWarning))
+            self.assertIn("_clear_type_cache", str(w[0].message))
 
     @force_not_colorized
     @support.requires_subprocess()