def setUp(self):
ics = np.random.laplace(size=(3, 1024))
np.random.seed(1)
mixing_matrix = np.random.random((100, 3))
s = Image(np.dot(mixing_matrix, ics).reshape((100, 32, 32)))
for (axis, name) in zip(s.axes_manager._axes, ("z", "y", "x")):
axis.name = name
s.decomposition()
self.s = s
