Fix test_while_is_not with python 3.115.1.0

The test_while_is_not function relied on strings and literals to test
the 'while_is_not' function. But the while_is_not function uses the 'is'
operator to test the equivalency of 2 objects.
This triggers a bug with python 3.11 where using 'is' with literals is
not advised (it is not recommended since python 3.8 [0]).
The test now uses objects from a specific class to evaluate the
while_is_not function.

[0] https://docs.python.org/3/whatsnew/3.8.html#changes-in-python-behavior

Change-Id: I38a0135aaf73e25aa20a11c0685d5c2a7b587a07

1 files changed, 18 insertions, 11 deletions

diff --git a/taskflow/tests/unit/test_utils_iter_utils.py b/taskflow/tests/unit/test_utils_iter_utils.py
index c4109d8..3a37717 100644
--- a/taskflow/tests/unit/test_utils_iter_utils.py
+++ b/taskflow/tests/unit/test_utils_iter_utils.py
@@ -140,14 +140,21 @@ class IterUtilsTest(test.TestCase):
         self.assertRaises(ValueError, iter_utils.while_is_not, 2, 'a')
 
     def test_while_is_not(self):
-        it = iter(string.ascii_lowercase)
-        self.assertEqual(['a'],
-                         list(iter_utils.while_is_not(it, 'a')))
-        it = iter(string.ascii_lowercase)
-        self.assertEqual(['a', 'b'],
-                         list(iter_utils.while_is_not(it, 'b')))
-        self.assertEqual(list(string.ascii_lowercase[2:]),
-                         list(iter_utils.while_is_not(it, 'zzz')))
-        it = iter(string.ascii_lowercase)
-        self.assertEqual(list(string.ascii_lowercase),
-                         list(iter_utils.while_is_not(it, '')))
+        class Dummy(object):
+            def __init__(self, char):
+                self.char = char
+        dummy_list = [Dummy(a)
+                      for a in string.ascii_lowercase]
+
+        it = iter(dummy_list)
+        self.assertEqual([dummy_list[0]],
+                         list(iter_utils.while_is_not(it, dummy_list[0])))
+        it = iter(dummy_list)
+        self.assertEqual(dummy_list[0:2],
+                         list(iter_utils.while_is_not(it, dummy_list[1])))
+        self.assertEqual(dummy_list[2:],
+                         list(iter_utils.while_is_not(it, Dummy('zzz'))))
+
+        it = iter(dummy_list)
+        self.assertEqual(dummy_list,
+                         list(iter_utils.while_is_not(it, Dummy(''))))