try fix test for old numpy

pandas/tests/extension/test_boolean.py

@@ -16,6 +16,8 @@
 import numpy as np
 import pytest
 
+from pandas.compat.numpy import _np_version_under1p14
+
 import pandas as pd
 from pandas.core.arrays.boolean import BooleanDtype
 from pandas.tests.extension import base
@@ -107,7 +109,9 @@ def check_opname(self, s, op_name, other, exc=None):
     def _check_op(self, s, op, other, op_name, exc=NotImplementedError):
         if exc is None:
             if op_name in ("__sub__", "__rsub__"):
-                # subtraction for bools raises TypeError
+                # subtraction for bools raises TypeError (but not yet in 1.13)
+                if _np_version_under1p14:
+                    pytest.skip("__sub__ does not yet raise in numpy 1.13")
                 with pytest.raises(TypeError):
                     op(s, other)