def test_eq_must_specified(self):
"""
`total_ordering` requires `__eq__` to be specified.
"""
with pytest.raises(ValueError) as ei:
cmp_using(lt=lambda a, b: a < b)
assert ei.value.args[0] == (
"eq must be define is order to complete ordering from "
"lt, le, gt, ge.")
class TestDundersUnnamedClass(object):
"""
Tests for dunder attributes of unnamed classes.
"""
cls = cmp_using(eq=lambda a, b: a == b)
def test_class(self):
"""
Class name and qualified name should be well behaved.
"""
assert self.cls.__name__ == "Comparable"
if not PY2:
assert self.cls.__qualname__ == "Comparable"
def test_eq(self):
"""
__eq__ docstring and qualified name should be well behaved.
"""
method = self.cls.__eq__
assert method.__doc__.strip() == "Return a == b. Computed by attrs."
assert method.__name__ == "__eq__"
def test_ne(self):
"""
__ne__ docstring and qualified name should be well behaved.
"""
method = self.cls.__ne__
assert method.__doc__.strip() == (
"Check equality and either forward a NotImplemented or\n"
" return the result negated.")
assert method.__name__ == "__ne__"
def test_not_implemented_is_propagated(self):
"""
If the comparison function returns NotImplemented,
the dunder method should too.
"""
C = cmp_using(eq=lambda a, b: NotImplemented if a == 1 else a == b)
assert C(2) == C(2)
assert C(1) != C(1)
"""
Tests for methods from `attrib._cmp`.
"""
from __future__ import absolute_import, division, print_function
import pytest
from attr._cmp import cmp_using
from attr._compat import PY2
# Test parameters.
EqCSameType = cmp_using(eq=lambda a, b: a == b, class_name="EqCSameType")
PartialOrderCSameType = cmp_using(
eq=lambda a, b: a == b,
lt=lambda a, b: a < b,
class_name="PartialOrderCSameType",
)
FullOrderCSameType = cmp_using(
eq=lambda a, b: a == b,
lt=lambda a, b: a < b,
le=lambda a, b: a <= b,
gt=lambda a, b: a > b,
ge=lambda a, b: a >= b,
class_name="FullOrderCSameType",
)
EqCAnyType = cmp_using(eq=lambda a, b: a == b,
require_same_type=False,
class_name="EqCAnyType")
PartialOrderCAnyType = cmp_using(