def test_shift_without_domain_shift():
f = Function(np.linspace(0, 10, 100), lambda x: 5 * x)
shift = 2
fshifted = Function(f.get_domain(), lambda x: 5 * (x - shift))
f = f.shift(shift)
for x in fshifted.get_domain():
assert abs(fshifted(x) - f(x)) == 0
def test_shift_with_domain_shift():
f = Function(np.linspace(0, 10, 100), lambda x: 5 * x)
shift = 10
fshifted = Function(np.linspace(10, 20, 100), lambda x: 5 * (x - shift))
f = f.shift(shift, domain=True)
for x in fshifted.get_domain():
assert abs(fshifted(x) - f(x)) == 0