From 008e5e9c6ee24b6675dc582373c4a14cbe5ec22e Mon Sep 17 00:00:00 2001
From: Charles Harris <charlesr.harris@gmail.com>
Date: Tue, 6 Dec 2011 21:53:45 -0700
Subject: [PATCH] TST: Add test for weight modification.

---
 numpy/ma/tests/test_extras.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/numpy/ma/tests/test_extras.py b/numpy/ma/tests/test_extras.py
index be995d617f35..f1b36a15d5b2 100644
--- a/numpy/ma/tests/test_extras.py
+++ b/numpy/ma/tests/test_extras.py
@@ -632,11 +632,13 @@ def test_polyfit(self):
             assert_almost_equal(a, a_)
         #
         w =  np.random.rand(10) + 1
+        wo = w.copy()
         xs = x[1:-1]
         ys = y[1:-1]
         ws = w[1:-1]
         (C, R, K, S, D) = polyfit(x, y, 3, full=True, w=w)
         (c, r, k, s, d) = np.polyfit(xs, ys, 3, full=True, w=ws)
+        assert_equal(w, wo)
         for (a, a_) in zip((C, R, K, S, D), (c, r, k, s, d)):
             assert_almost_equal(a, a_)