def test_div_base_derived():
assert u.v / u.a == u.DerivedUnit("volt / ampere", "kg·m²·s⁻³·A⁻²",
[(u.kg, 1), (u.m, 2), (u.s, -3),
(u.a, -2)], "potential / current")
def test_div_derived():
assert u.ohm / u.f == u.DerivedUnit("ohm / farad", "kg²·m⁴·s⁻⁷·A⁻⁴",
[(u.kg, 2), (u.m, 4), (u.s, -7),
(u.a, -4)],
"resistance / capacitance")
def test_div_base():
assert u.a / u.cd**2 == u.DerivedUnit("ampere / candela²", "A·cd⁻²",
[(u.a, 1),
(u.cd, -2)], "current / luminosity")
def test_mul_base_derived():
assert u.a * u.v == u.DerivedUnit("ampere·volt", "kg·m²·s⁻³", [(u.kg, 1),
(u.m, 2),
(u.s, -3)],
"potential · current")
def test_mul_derived():
assert u.ohm * u.f == u.DerivedUnit("ohm · farad", "s", [(u.s, 1)],
"resistance · capacitance")
def test_mul_base():
assert u.kg * u.s == u.DerivedUnit("kilogram · meter", "kg·m", [(u.kg, 1),
(u.s, 1)],
"mass · distance")