add test for newstr.__hash__()

Author: ghanshyam-lele

tests/test_future/test_str.py

@@ -363,6 +363,10 @@ def test_eq(self):
             self.assertFalse(b'ABCD' == s)
         self.assertFalse(bytes(b'ABCD') == s)
 
+    def test_hash(self):
+        s = str('ABCD')
+        self.assertIsInstance(hash(s),int)
+
     def test_ne(self):
         s = str('ABCD')
         self.assertNotEqual('A', s)