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import pytest
from pint import UnitRegistry
# Conditionally import NumPy and any upcast type libraries
np = pytest.importorskip("numpy", reason="NumPy is not available")
sparse = pytest.importorskip("sparse", reason="sparse is not available")
da = pytest.importorskip("dask.array", reason="Dask is not available")
def WR(func):
"""Function to wrap another containing 1 argument.
Used to parametrize tests in which some cases depend
on the registry while avoiding to create it at the module level
"""
return lambda ureg, x: func(x)
def WR2(func):
"""Function to wrap another containing 2 argument.
Used to parametrize tests in which some cases depend
on the registry while avoiding to create it at the module level
"""
return lambda ureg, x, y: func(x, y)
@pytest.fixture(scope="module")
def local_registry():
# Set up unit registry and sample
return UnitRegistry(force_ndarray_like=True)
@pytest.fixture(scope="module")
def q_base(local_registry):
# Set up unit registry and sample
return (np.arange(25).reshape(5, 5).T + 1) * local_registry.kg
# Define identity function for use in tests
def identity(ureg, x):
return x
@pytest.fixture(params=["sparse", "masked_array", "dask_array"])
def array(request):
"""Generate 5x5 arrays of given type for tests."""
if request.param == "sparse":
# Create sample sparse COO as a permutation matrix.
coords = [[0, 1, 2, 3, 4], [1, 3, 0, 2, 4]]
data = [1.0] * 5
return sparse.COO(coords, data, shape=(5, 5))
elif request.param == "masked_array":
# Create sample masked array as an upper triangular matrix.
return np.ma.masked_array(
np.arange(25, dtype=float).reshape((5, 5)),
mask=np.logical_not(np.triu(np.ones((5, 5)))),
)
elif request.param == "dask_array":
return da.arange(25, chunks=5, dtype=float).reshape((5, 5))
@pytest.mark.parametrize(
"op, magnitude_op, unit_op",
[
pytest.param(identity, identity, identity, id="identity"),
pytest.param(
lambda ureg, x: x + 1 * ureg.m,
lambda ureg, x: x + 1,
identity,
id="addition",
),
pytest.param(
lambda ureg, x: x - 20 * ureg.cm,
lambda ureg, x: x - 0.2,
identity,
id="subtraction",
),
pytest.param(
lambda ureg, x: x * (2 * ureg.s),
lambda ureg, x: 2 * x,
lambda ureg, u: u * ureg.s,
id="multiplication",
),
pytest.param(
lambda ureg, x: x / (1 * ureg.s),
identity,
lambda ureg, u: u / ureg.s,
id="division",
),
pytest.param(
WR(lambda x: x**2),
WR(lambda x: x**2),
WR(lambda u: u**2),
id="square",
),
pytest.param(WR(lambda x: x.T), WR(lambda x: x.T), identity, id="transpose"),
pytest.param(WR(np.mean), WR(np.mean), identity, id="mean ufunc"),
pytest.param(WR(np.sum), WR(np.sum), identity, id="sum ufunc"),
pytest.param(WR(np.sqrt), WR(np.sqrt), WR(lambda u: u**0.5), id="sqrt ufunc"),
pytest.param(
WR(lambda x: np.reshape(x, (25,))),
WR(lambda x: np.reshape(x, (25,))),
identity,
id="reshape function",
),
pytest.param(WR(np.amax), WR(np.amax), identity, id="amax function"),
],
)
def test_univariate_op_consistency(
local_registry, q_base, op, magnitude_op, unit_op, array
):
q = local_registry.Quantity(array, "meter")
res = op(local_registry, q)
assert np.all(
res.magnitude == magnitude_op(local_registry, array)
) # Magnitude check
assert res.units == unit_op(local_registry, q.units) # Unit check
assert q.magnitude is array # Immutability check
@pytest.mark.parametrize(
"op, unit",
[
pytest.param(
lambda x, y: x * y, lambda ureg: ureg("kg m"), id="multiplication"
),
pytest.param(lambda x, y: x / y, lambda ureg: ureg("m / kg"), id="division"),
pytest.param(np.multiply, lambda ureg: ureg("kg m"), id="multiply ufunc"),
],
)
def test_bivariate_op_consistency(local_registry, q_base, op, unit, array):
# This is to avoid having a ureg built at the module level.
unit = unit(local_registry)
q = local_registry.Quantity(array, "meter")
res = op(q, q_base)
assert np.all(res.magnitude == op(array, q_base.magnitude)) # Magnitude check
assert res.units == unit # Unit check
assert q.magnitude is array # Immutability check
@pytest.mark.parametrize(
"op",
[
pytest.param(
WR2(lambda a, u: a * u),
id="array-first",
marks=pytest.mark.xfail(reason="upstream issue numpy/numpy#15200"),
),
pytest.param(WR2(lambda a, u: u * a), id="unit-first"),
],
)
@pytest.mark.parametrize(
"unit",
[
pytest.param(lambda ureg: ureg.m, id="Unit"),
pytest.param(lambda ureg: ureg("meter"), id="Quantity"),
],
)
def test_array_quantity_creation_by_multiplication(
local_registry, q_base, op, unit, array
):
# This is to avoid having a ureg built at the module level.
unit = unit(local_registry)
assert type(op(local_registry, array, unit)) == local_registry.Quantity
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