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diff --git a/src/silx/image/marchingsquares/test/test_funcapi.py b/src/silx/image/marchingsquares/test/test_funcapi.py
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+# -*- coding: utf-8 -*-
+#
+#    Project: silx
+#             https://github.com/silx-kit/silx
+#
+#    Copyright (C) 2012-2016  European Synchrotron Radiation Facility, Grenoble, France
+#
+# 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.
+
+__authors__ = ["V. Valls"]
+__license__ = "MIT"
+__date__ = "17/04/2018"
+
+import unittest
+import numpy
+import silx.image.marchingsquares
+
+
+class MockMarchingSquares(object):
+
+    last = None
+
+    def __init__(self, image, mask=None):
+        MockMarchingSquares.last = self
+        self.events = []
+        self.events.append(("image", image))
+        self.events.append(("mask", mask))
+
+    def find_pixels(self, level):
+        self.events.append(("find_pixels", level))
+        return None
+
+    def find_contours(self, level):
+        self.events.append(("find_contours", level))
+        return None
+
+
+class TestFunctionalApi(unittest.TestCase):
+    """Test that the default functional API is called using the right
+    parameters to the right location."""
+
+    def setUp(self):
+        self.old_impl = silx.image.marchingsquares.MarchingSquaresMergeImpl
+        silx.image.marchingsquares.MarchingSquaresMergeImpl = MockMarchingSquares
+
+    def tearDown(self):
+        silx.image.marchingsquares.MarchingSquaresMergeImpl = self.old_impl
+        del self.old_impl
+
+    def test_default_find_contours(self):
+        image = numpy.ones((2, 2), dtype=numpy.float32)
+        mask = numpy.zeros((2, 2), dtype=numpy.int32)
+        level = 2.5
+        silx.image.marchingsquares.find_contours(image=image, level=level, mask=mask)
+        events = MockMarchingSquares.last.events
+        self.assertEqual(len(events), 3)
+        self.assertEqual(events[0][0], "image")
+        self.assertEqual(events[0][1][0, 0], 1)
+        self.assertEqual(events[1][0], "mask")
+        self.assertEqual(events[1][1][0, 0], 0)
+        self.assertEqual(events[2][0], "find_contours")
+        self.assertEqual(events[2][1], level)
+
+    def test_default_find_pixels(self):
+        image = numpy.ones((2, 2), dtype=numpy.float32)
+        mask = numpy.zeros((2, 2), dtype=numpy.int32)
+        level = 3.5
+        silx.image.marchingsquares.find_pixels(image=image, level=level, mask=mask)
+        events = MockMarchingSquares.last.events
+        self.assertEqual(len(events), 3)
+        self.assertEqual(events[0][0], "image")
+        self.assertEqual(events[0][1][0, 0], 1)
+        self.assertEqual(events[1][0], "mask")
+        self.assertEqual(events[1][1][0, 0], 0)
+        self.assertEqual(events[2][0], "find_pixels")
+        self.assertEqual(events[2][1], level)