Fix tests

Author: emmatyping

Lib/test/test_zstd.py

@@ -410,7 +410,7 @@ def test_set_pledged_input_size(self):
         c.compress(b'123456')
         self.assertEqual(c.last_mode, c.CONTINUE)
         with self.assertRaisesRegex(RuntimeError,
-                                    r'\.last_mode == \.FLUSH_FRAME'):
+                                    r'last_mode == FLUSH_FRAME'):
             c.set_pledged_input_size(300)
 
         # None value