Using null context manager from pandas.util.testing.

Author: victor

pandas/tests/scalar/timedelta/test_construction.py

@@ -8,12 +8,6 @@
 import pandas.util.testing as tm
 from pandas import Timedelta
 
-import sys
-if sys.version_info >= (3, 3):
-    from contextlib import ExitStack as do_not_raise
-else:
-    from contextlib2 import ExitStack as do_not_raise
-
 
 def test_construction():
     expected = np.timedelta64(10, 'D').astype('m8[ns]').view('i8')
@@ -219,7 +213,7 @@ def test_td_constructor_value_error():
 
 
 @pytest.mark.parametrize("redundant_unit, expectation", [
-    ("", do_not_raise()),
+    ("", tm.do_not_raise),
     ("d", pytest.raises(ValueError)),
     ("us", pytest.raises(ValueError))])
 @pytest.mark.parametrize("unit", [