bpo-35412: Add testcase to test_future4 (GH-11131)

Add testcase to test_future4: check unicode literal.

Author: vstinner

Lib/test/test_future4.py

@@ -1,6 +1,11 @@
 from __future__ import unicode_literals
-
 import unittest
 
+
+class Tests(unittest.TestCase):
+    def test_unicode_literals(self):
+        self.assertIsInstance("literal", str)
+
+
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Tests/2018-12-12-18-07-58.bpo-35412.kbuJor.rst

@@ -0,0 +1 @@
+Add testcase to ``test_future4``: check unicode literal.