/
testing.py
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/
testing.py
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"""Testing functions exposed to the user API"""
from collections import OrderedDict
from typing import Hashable, Union
import numpy as np
import pandas as pd
from xarray.core import duck_array_ops
from xarray.core import formatting
from xarray.core.dataarray import DataArray
from xarray.core.dataset import Dataset
from xarray.core.variable import IndexVariable, Variable
from xarray.core.indexes import default_indexes
def _decode_string_data(data):
if data.dtype.kind == 'S':
return np.core.defchararray.decode(data, 'utf-8', 'replace')
return data
def _data_allclose_or_equiv(arr1, arr2, rtol=1e-05, atol=1e-08,
decode_bytes=True):
if any(arr.dtype.kind == 'S' for arr in [arr1, arr2]) and decode_bytes:
arr1 = _decode_string_data(arr1)
arr2 = _decode_string_data(arr2)
exact_dtypes = ['M', 'm', 'O', 'S', 'U']
if any(arr.dtype.kind in exact_dtypes for arr in [arr1, arr2]):
return duck_array_ops.array_equiv(arr1, arr2)
else:
return duck_array_ops.allclose_or_equiv(
arr1, arr2, rtol=rtol, atol=atol)
def assert_equal(a, b):
"""Like :py:func:`numpy.testing.assert_array_equal`, but for xarray
objects.
Raises an AssertionError if two objects are not equal. This will match
data values, dimensions and coordinates, but not names or attributes
(except for Dataset objects for which the variable names must match).
Arrays with NaN in the same location are considered equal.
Parameters
----------
a : xarray.Dataset, xarray.DataArray or xarray.Variable
The first object to compare.
b : xarray.Dataset, xarray.DataArray or xarray.Variable
The second object to compare.
See also
--------
assert_identical, assert_allclose, Dataset.equals, DataArray.equals,
numpy.testing.assert_array_equal
"""
__tracebackhide__ = True # noqa: F841
assert type(a) == type(b) # noqa
if isinstance(a, (Variable, DataArray)):
assert a.equals(b), formatting.diff_array_repr(a, b, 'equals')
elif isinstance(a, Dataset):
assert a.equals(b), formatting.diff_dataset_repr(a, b, 'equals')
else:
raise TypeError('{} not supported by assertion comparison'
.format(type(a)))
def assert_identical(a, b):
"""Like :py:func:`xarray.testing.assert_equal`, but also matches the
objects' names and attributes.
Raises an AssertionError if two objects are not identical.
Parameters
----------
a : xarray.Dataset, xarray.DataArray or xarray.Variable
The first object to compare.
b : xarray.Dataset, xarray.DataArray or xarray.Variable
The second object to compare.
See also
--------
assert_equal, assert_allclose, Dataset.equals, DataArray.equals
"""
__tracebackhide__ = True # noqa: F841
assert type(a) == type(b) # noqa
if isinstance(a, Variable):
assert a.identical(b), formatting.diff_array_repr(a, b, 'identical')
elif isinstance(a, DataArray):
assert a.name == b.name
assert a.identical(b), formatting.diff_array_repr(a, b, 'identical')
elif isinstance(a, (Dataset, Variable)):
assert a.identical(b), formatting.diff_dataset_repr(a, b, 'identical')
else:
raise TypeError('{} not supported by assertion comparison'
.format(type(a)))
def assert_allclose(a, b, rtol=1e-05, atol=1e-08, decode_bytes=True):
"""Like :py:func:`numpy.testing.assert_allclose`, but for xarray objects.
Raises an AssertionError if two objects are not equal up to desired
tolerance.
Parameters
----------
a : xarray.Dataset, xarray.DataArray or xarray.Variable
The first object to compare.
b : xarray.Dataset, xarray.DataArray or xarray.Variable
The second object to compare.
rtol : float, optional
Relative tolerance.
atol : float, optional
Absolute tolerance.
decode_bytes : bool, optional
Whether byte dtypes should be decoded to strings as UTF-8 or not.
This is useful for testing serialization methods on Python 3 that
return saved strings as bytes.
See also
--------
assert_identical, assert_equal, numpy.testing.assert_allclose
"""
__tracebackhide__ = True # noqa: F841
assert type(a) == type(b) # noqa
kwargs = dict(rtol=rtol, atol=atol, decode_bytes=decode_bytes)
if isinstance(a, Variable):
assert a.dims == b.dims
allclose = _data_allclose_or_equiv(a.values, b.values, **kwargs)
assert allclose, '{}\n{}'.format(a.values, b.values)
elif isinstance(a, DataArray):
assert_allclose(a.variable, b.variable, **kwargs)
assert set(a.coords) == set(b.coords)
for v in a.coords.variables:
# can't recurse with this function as coord is sometimes a
# DataArray, so call into _data_allclose_or_equiv directly
allclose = _data_allclose_or_equiv(a.coords[v].values,
b.coords[v].values, **kwargs)
assert allclose, '{}\n{}'.format(a.coords[v].values,
b.coords[v].values)
elif isinstance(a, Dataset):
assert set(a.data_vars) == set(b.data_vars)
assert set(a.coords) == set(b.coords)
for k in list(a.variables) + list(a.coords):
assert_allclose(a[k], b[k], **kwargs)
else:
raise TypeError('{} not supported by assertion comparison'
.format(type(a)))
def _assert_indexes_invariants_checks(indexes, possible_coord_variables, dims):
assert isinstance(indexes, OrderedDict), indexes
assert all(isinstance(v, pd.Index) for v in indexes.values()), \
{k: type(v) for k, v in indexes.items()}
index_vars = {k for k, v in possible_coord_variables.items()
if isinstance(v, IndexVariable)}
assert indexes.keys() <= index_vars, (set(indexes), index_vars)
# Note: when we support non-default indexes, these checks should be opt-in
# only!
defaults = default_indexes(possible_coord_variables, dims)
assert indexes.keys() == defaults.keys(), \
(set(indexes), set(defaults))
assert all(v.equals(defaults[k]) for k, v in indexes.items()), \
(indexes, defaults)
def _assert_variable_invariants(var: Variable, name: Hashable = None):
if name is None:
name_or_empty = () # type: tuple
else:
name_or_empty = (name,)
assert isinstance(var._dims, tuple), name_or_empty + (var._dims,)
assert len(var._dims) == len(var._data.shape), \
name_or_empty + (var._dims, var._data.shape)
assert isinstance(var._encoding, (type(None), dict)), \
name_or_empty + (var._encoding,)
assert isinstance(var._attrs, (type(None), OrderedDict)), \
name_or_empty + (var._attrs,)
def _assert_dataarray_invariants(da: DataArray):
assert isinstance(da._variable, Variable), da._variable
_assert_variable_invariants(da._variable)
assert isinstance(da._coords, OrderedDict), da._coords
assert all(
isinstance(v, Variable) for v in da._coords.values()), da._coords
assert all(set(v.dims) <= set(da.dims) for v in da._coords.values()), \
(da.dims, {k: v.dims for k, v in da._coords.items()})
assert all(isinstance(v, IndexVariable)
for (k, v) in da._coords.items()
if v.dims == (k,)), \
{k: type(v) for k, v in da._coords.items()}
for k, v in da._coords.items():
_assert_variable_invariants(v, k)
if da._indexes is not None:
_assert_indexes_invariants_checks(da._indexes, da._coords, da.dims)
assert da._initialized is True
def _assert_dataset_invariants(ds: Dataset):
assert isinstance(ds._variables, OrderedDict), type(ds._variables)
assert all(
isinstance(v, Variable) for v in ds._variables.values()), \
ds._variables
for k, v in ds._variables.items():
_assert_variable_invariants(v, k)
assert isinstance(ds._coord_names, set), ds._coord_names
assert ds._coord_names <= ds._variables.keys(), \
(ds._coord_names, set(ds._variables))
assert type(ds._dims) is dict, ds._dims
assert all(isinstance(v, int) for v in ds._dims.values()), ds._dims
var_dims = set() # type: set
for v in ds._variables.values():
var_dims.update(v.dims)
assert ds._dims.keys() == var_dims, (set(ds._dims), var_dims)
assert all(ds._dims[k] == v.sizes[k]
for v in ds._variables.values()
for k in v.sizes), \
(ds._dims, {k: v.sizes for k, v in ds._variables.items()})
assert all(isinstance(v, IndexVariable)
for (k, v) in ds._variables.items()
if v.dims == (k,)), \
{k: type(v) for k, v in ds._variables.items() if v.dims == (k,)}
assert all(v.dims == (k,)
for (k, v) in ds._variables.items()
if k in ds._dims), \
{k: v.dims for k, v in ds._variables.items() if k in ds._dims}
if ds._indexes is not None:
_assert_indexes_invariants_checks(ds._indexes, ds._variables, ds._dims)
assert isinstance(ds._encoding, (type(None), dict))
assert isinstance(ds._attrs, (type(None), OrderedDict))
assert ds._initialized is True
def _assert_internal_invariants(
xarray_obj: Union[DataArray, Dataset, Variable],
):
"""Validate that an xarray object satisfies its own internal invariants.
This exists for the benefit of xarray's own test suite, but may be useful
in external projects if they (ill-advisedly) create objects using xarray's
private APIs.
"""
if isinstance(xarray_obj, Variable):
_assert_variable_invariants(xarray_obj)
elif isinstance(xarray_obj, DataArray):
_assert_dataarray_invariants(xarray_obj)
elif isinstance(xarray_obj, Dataset):
_assert_dataset_invariants(xarray_obj)
else:
raise TypeError(
'{} is not a supported type for xarray invariant checks'
.format(type(xarray_obj)))