TST: Regression test for gh-5719

Previously this would cause a segfault, now we check that this case
raises an OverflowError.

1 files changed, 7 insertions, 0 deletions

diff --git a/numpy/core/tests/test_dtype.py b/numpy/core/tests/test_dtype.py
index 2621c8696..3a255b038 100644
--- a/numpy/core/tests/test_dtype.py
+++ b/numpy/core/tests/test_dtype.py
@@ -3,6 +3,7 @@ from __future__ import division, absolute_import, print_function
 import sys
 import numpy as np
 from numpy.testing import *
+from numpy.core.test_rational import rational
 
 def assert_dtype_equal(a, b):
     assert_equal(a, b)
@@ -533,5 +534,11 @@ class TestDtypeAttributes(TestCase):
         assert_equal(np.dtype(user_def_subcls).name, 'user_def_subcls')
 
 
+def test_rational_dtype():
+    # test for bug gh-5719
+    a = np.array([1111], dtype=rational).astype
+    assert_raises(OverflowError, a, 'int8')
+
+
 if __name__ == "__main__":
     run_module_suite()