'Use a multi-dimensional array as the dataset and test silverman\'s
output'

def test_silverman_multidim_dataset(self):

    x1 = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
    with pytest.raises(np.linalg.LinAlgError):
        mlab.GaussianKDE(x1, u'silverman')
