'Test that a unit kernel with a single element returns the same array'

@pytest.mark.parametrize(option_names, options)
def test_unity_1_none(self, boundary, nan_treatment, normalize_kernel):

    x = np.array([1.0, 2.0, 3.0], dtype=u'float64')
    y = np.array([1.0], dtype=u'float64')
    z = convolve_fft(x, y, boundary=boundary, nan_treatment=nan_treatment, normalize_kernel=normalize_kernel)
    assert_array_almost_equal_nulp(z, x, 10)
