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[tests] Enable subTest context manager for Python 2

This allows using of subTest with Python 3 inside tests without
breaking Python 2.

Change-Id: I7cc6666ddb51f108f4cbc72405d30c2aba638da8
---
M tests/aspects.py
1 file changed, 6 insertions(+), 0 deletions(-)

diff --git a/tests/aspects.py b/tests/aspects.py
index ada517d..6695894 100644
--- a/tests/aspects.py
+++ b/tests/aspects.py
@@ -63,6 +63,12 @@
 
     """Base class for all tests."""
 
+    if not hasattr(unittest.TestCase, 'subTest'):
+        @contextmanager
+        def subTest(self, *args, **kwargs):
+            """Dummy subTest context manager for Python 2 that does nothing."""
+            yield
+
     if not hasattr(unittest.TestCase, 'assertRaisesRegex'):
         def assertRaisesRegex(self, *args, **kwargs):
             """

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