catch PerformanceWarning (#19446)

Author: jbrockmendel

pandas/tests/series/test_operators.py

@@ -19,6 +19,7 @@
 from pandas.core.indexes.timedeltas import Timedelta
 import pandas.core.nanops as nanops
 
+from pandas.errors import PerformanceWarning
 from pandas.compat import range, zip
 from pandas import compat
 from pandas.util.testing import (assert_series_equal, assert_almost_equal,
@@ -871,8 +872,9 @@ def test_timedelta64_operations_with_DateOffset(self):
         expected = Series([timedelta(minutes=4, seconds=3)] * 3)
         assert_series_equal(result, expected)
 
-        result = td + Series([pd.offsets.Minute(1), pd.offsets.Second(3),
-                              pd.offsets.Hour(2)])
+        with tm.assert_produces_warning(PerformanceWarning):
+            result = td + Series([pd.offsets.Minute(1), pd.offsets.Second(3),
+                                  pd.offsets.Hour(2)])
         expected = Series([timedelta(minutes=6, seconds=3), timedelta(
             minutes=5, seconds=6), timedelta(hours=2, minutes=5, seconds=3)])
         assert_series_equal(result, expected)