fix(TC): pytest mark xfail(PY<36) due to unstable dicts

Author: ankostis

test/test_graphkit.py

@@ -3,6 +3,7 @@
 
 import math
 import pickle
+import sys
 from operator import add, floordiv, mul, sub
 from pprint import pprint
 
@@ -361,6 +362,11 @@ def test_pruning_multiouts_not_override_intermediates1():
     assert pipeline(inputs, ["asked"]) == filtdict(exp, "asked")
 
 
+@pytest.mark.xfail(
+    sys.version_info < (3, 6),
+    reason="PY3.5- have unstable dicts."
+    "E.g. https://travis-ci.org/ankostis/graphkit/jobs/595841023",
+)
 def test_pruning_multiouts_not_override_intermediates2():
     # Test #25: v.1.2.4 overrides intermediate data when a previous operation
     # must run for its other outputs (outputs asked or not)
@@ -583,6 +589,11 @@ def increment(box):
     assert graph({"box": [0], "a": None})["box"] == [1, 1, 2]
 
 
+@pytest.mark.xfail(
+    sys.version_info < (3, 6),
+    reason="PY3.5- have unstable dicts."
+    "E.g. https://travis-ci.org/ankostis/graphkit/jobs/595793872",
+)
 def test_optional_per_function_with_same_output():
     # Test that the same need can be both optional and not on different operations.
     #