TST: add missing tests for all polynomial subclass pow fns.

1 files changed, 11 insertions, 0 deletions

diff --git a/numpy/polynomial/tests/test_polynomial.py b/numpy/polynomial/tests/test_polynomial.py
index 67728e35e..b5a3678a4 100644
--- a/numpy/polynomial/tests/test_polynomial.py
+++ b/numpy/polynomial/tests/test_polynomial.py
@@ -3,6 +3,8 @@
 """
 from __future__ import division, absolute_import, print_function
 
+from functools import reduce
+
 import numpy as np
 import numpy.polynomial.polynomial as poly
 from numpy.testing import (
@@ -102,6 +104,15 @@ class TestArithmetic(object):
                 res = poly.polyadd(poly.polymul(quo, ci), rem)
                 assert_equal(res, tgt, err_msg=msg)
 
+    def test_polypow(self):
+        for i in range(5):
+            for j in range(5):
+                msg = "At i=%d, j=%d" % (i, j)
+                c = np.arange(i + 1)
+                tgt = reduce(poly.polymul, [c]*j) if j else np.array([1])
+                res = poly.polypow(c, j) 
+                assert_equal(trim(res), trim(tgt), err_msg=msg)
+
 
 class TestEvaluation(object):
     # coefficients of 1 + 2*x + 3*x**2