def test_back_and_forth():
"""Test that Lattice.miller_indices and Lattice.scattering_vector are
reciprocal to each other"""
lattice = Lattice(np.random.random((3, 3)))
h, k, l = np.random.randint(-10, 10, size=(3, ))
vector = lattice.scattering_vector((h, k, l))
hp, kp, lp = lattice.miller_indices(vector)
assert round(abs(h - float(hp)), 7) == 0
assert round(abs(k - float(kp)), 7) == 0
assert round(abs(l - float(lp)), 7) == 0
def test_scattering_vector_table():
""" Test that Lattice.scattering_vector is working on tables of reflections """
lattice = Lattice(2 * np.pi * np.eye(3))
vectors = np.random.random(size=(10, 3))
assert np.allclose(lattice.scattering_vector(vectors), vectors)
def test_scattering_vector_trivial():
""" Test that Lattice.scattering_vectors is working """
lattice = Lattice(np.random.random((3, 3)))
assert np.allclose(lattice.scattering_vector((0, 0, 0)), ((0, 0, 0)))
