def test_shearing_x_z():
t = shearing(0, 1, 0, 0, 0, 0)
p = Point(2, 3, 4)
assert t * p == Point(6, 3, 4)
def test_shearing_x_y():
t = shearing(1, 0, 0, 0, 0, 0)
p = Point(2, 3, 4)
assert t * p == Point(5, 3, 4)
def test_shearing_z_x():
t = shearing(0, 0, 0, 0, 1, 0)
p = Point(2, 3, 4)
assert t * p == Point(2, 3, 6)
def test_shearing_z_y():
t = shearing(0, 0, 0, 0, 0, 1)
p = Point(2, 3, 4)
assert t * p == Point(2, 3, 7)
def assign_shearing(context, var, x_y, x_z, y_x, y_z, z_x, z_y):
context.variables[var] = shearing(x_y, x_z, y_x, y_z, z_x, z_y)