def test___add__():
assert kg + kg == si.Physical(2, si.Dimensions(1, 0, 0, 0, 0, 0, 0), 1)
assert m + ft == si.Physical(1.3048, si.Dimensions(0, 1, 0, 0, 0, 0, 0), 1)
assert ft + m == si.Physical(1.3048, si.Dimensions(0, 1, 0, 0, 0, 0, 0),
1 / 0.3048)
assert N + lb == si.Physical(5.4482216152605005,
si.Dimensions(1, 1, -2, 0, 0, 0, 0), 1)
assert lb + N == si.Physical(5.4482216152605005,
si.Dimensions(1, 1, -2, 0, 0, 0, 0),
0.22480894309971047)
assert ft + 3 == si.Physical(1.2192, si.Dimensions(0, 1, 0, 0, 0, 0, 0),
1 / 0.3048)
with pytest.raises(ValueError):
kg + m
N + psf
def test__get_derived_unit():
func = phf._get_derived_unit
assert func(si.Dimensions(1, 1, -2, 0, 0, 0, 0), env_dims) == {
"N": {
"Dimension": si.Dimensions(kg=1, m=1, s=-2, A=0, cd=0, K=0, mol=0),
"Factor": 1,
}
}
assert func(si.Dimensions(1, 0, 0, 0, 0, 0, 0), env_dims) == {}
assert func(si.Dimensions(1, 0, -2, 0, 0, 0, 0), env_dims) == {
"N_m": {
"Dimension": si.Dimensions(kg=1, m=0, s=-2, A=0, cd=0, K=0, mol=0),
"Factor": 1,
"Symbol": "N/m",
}
}
assert func(si.Dimensions(1, 1, 1, 1, 1, 1, 1), env_dims) == {}
def test___pow__():
assert N**2 == si.Physical(1, si.Dimensions(2, 2, -4, 0, 0, 0, 0), 1)
assert ft**3 == si.Physical(0.3048**3, si.Dimensions(0, 3, 0, 0, 0, 0, 0),
(1 / 0.3048)**3)
def test___rsub__():
assert 2 - ft == si.Physical(0.3048, si.Dimensions(0, 1, 0, 0, 0, 0, 0),
1 / 0.3048)
assert 10 - N == si.Physical(9, si.Dimensions(1, 1, -2, 0, 0, 0, 0), 1)
def test__check_dims_parallel():
assert phf._check_dims_parallel((3, 2, 1, 0), (6, 4, 2, 0))
assert phf._check_dims_parallel(si.Dimensions(1, 2, -2, 0, 0, 0, 0),
si.Dimensions(-1, -2, 2, 0, 0, 0, 0))