From 3c4f17b7d6d44b3076be9d50e305ed71836fa5d9 Mon Sep 17 00:00:00 2001
From: Eric Wieser <wieser.eric@gmail.com>
Date: Tue, 21 Mar 2017 21:59:18 +0000
Subject: TST: Prove that poly1d coeffs are immutable

Remove the comment suggesting that they are not
---
 numpy/lib/tests/test_polynomial.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'numpy/lib/tests/test_polynomial.py')

diff --git a/numpy/lib/tests/test_polynomial.py b/numpy/lib/tests/test_polynomial.py
index f1e4543bb..0725c186d 100644
--- a/numpy/lib/tests/test_polynomial.py
+++ b/numpy/lib/tests/test_polynomial.py
@@ -222,6 +222,20 @@ class TestDocs(TestCase):
         assert_equal(p == p2, False)
         assert_equal(p != p2, True)
 
+    def test_poly_coeffs_immutable(self):
+        """ Coefficients should not be modifiable """
+        p = np.poly1d([1, 2, 3])
+
+        try:
+            # despite throwing an exception, this used to change state
+            p.coeffs += 1
+        except Exception:
+            pass
+        assert_equal(p.coeffs, [1, 2, 3])
+
+        p.coeffs[2] += 10
+        assert_equal(p.coeffs, [1, 2, 3])
+
 
 if __name__ == "__main__":
     run_module_suite()
-- 
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