From a2cde5ebb07f839b8191d6988aa680bcae3360fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20Sch=C3=B6nberger?= <jsch@demuc.de>
Date: Fri, 22 Nov 2013 00:17:59 +0100
Subject: [PATCH] Test invalid inplace operation

---
 skimage/morphology/tests/test_grey.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/skimage/morphology/tests/test_grey.py b/skimage/morphology/tests/test_grey.py
index e2a3928d..f0099ee5 100644
--- a/skimage/morphology/tests/test_grey.py
+++ b/skimage/morphology/tests/test_grey.py
@@ -155,5 +155,15 @@ class TestDTypes():
         self._test_image(image)
 
 
+def test_inplace():
+    selem = np.ones((3, 3))
+    image = np.zeros((5, 5))
+    out = image
+
+    for f in (grey.erosion, grey.dilation,
+              grey.white_tophat, grey.black_tophat):
+        testing.assert_raises(NotImplementedError, f, image, selem, out=out)
+
+
 if __name__ == '__main__':
     testing.run_module_suite()