test: add test on switch between np.array and np.matrix

unittest/CMakeLists.txt

 #
-# Copyright (c) 2016-2018 CNRS
+# Copyright (c) 2016-2018 CNRS INRIA
 #
 # This file is part of eigenpy
 # eigenpy is free software: you can redistribute it
@@ -46,3 +46,4 @@ ENDIF()
 
 ADD_PYTHON_UNIT_TEST("py-matrix" "unittest/python/test_matrix.py" "unittest")
 ADD_PYTHON_UNIT_TEST("py-geometry" "unittest/python/test_geometry.py" "unittest")
+ADD_PYTHON_UNIT_TEST("py-switch" "unittest/python/test_switch.py" "unittest")

unittest/python/test_switch.py

+from __future__ import print_function
+
+import eigenpy
+import numpy as np
+
+quat = eigenpy.Quaternion()
+# By default, we convert as numpy.matrix
+coeffs_vector = quat.coeffs() 
+print(type(coeffs_vector))
+
+assert isinstance(coeffs_vector,np.matrixlib.defmatrix.matrix)
+
+# Switch to numpy.array
+eigenpy.switchToNumpyArray()
+coeffs_array = quat.coeffs()
+print(type(coeffs_array))
+
+assert isinstance(coeffs_vector,np.ndarray)