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diff --git a/src/silx/image/test/test_medianfilter.py b/src/silx/image/test/test_medianfilter.py
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+# /*##########################################################################
+#
+# Copyright (c) 2016-2017 European Synchrotron Radiation Facility
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# ############################################################################*/
+"""Tests that the different implementation of opencl (cpp, opencl) are
+    accessible
+"""
+
+__authors__ = ["H. Payno"]
+__license__ = "MIT"
+__date__ = "11/05/2017"
+
+import unittest
+from silx.image import medianfilter
+import numpy
+
+from silx.opencl.common import ocl
+
+
+class TestMedianFilterEngines(unittest.TestCase):
+    """Make sure we have access to all the different implementation of
+    median filter from image medfilt"""
+
+    IMG = numpy.arange(10000.0).reshape(100, 100)
+
+    KERNEL = (1, 1)
+
+    def testCppMedFilt2d(self):
+        """test cpp engine for medfilt2d"""
+        res = medianfilter.medfilt2d(
+            image=TestMedianFilterEngines.IMG,
+            kernel_size=TestMedianFilterEngines.KERNEL,
+            engine="cpp",
+        )
+        self.assertTrue(numpy.array_equal(res, TestMedianFilterEngines.IMG))
+
+    @unittest.skipUnless(ocl, "PyOpenCl is missing")
+    def testOpenCLMedFilt2d(self):
+        """test cpp engine for medfilt2d"""
+        res = medianfilter.medfilt2d(
+            image=TestMedianFilterEngines.IMG,
+            kernel_size=TestMedianFilterEngines.KERNEL,
+            engine="opencl",
+        )
+        self.assertTrue(numpy.array_equal(res, TestMedianFilterEngines.IMG))