Viewing file:  isnot.py (2.13 KB) -rw-r--r--
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from typing import Type, TypeVar, Union, overload
from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.helpers.wrap_matcher import is_matchable_type, wrap_matcher
from hamcrest.core.matcher import Matcher
from .isinstanceof import instance_of
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
T = TypeVar("T")
class IsNot(BaseMatcher[T]):
def __init__(self, matcher: Matcher[T]) -> None:
self.matcher = matcher
def _matches(self, item: T) -> bool:
return not self.matcher.matches(item)
def describe_to(self, description: Description) -> None:
description.append_text("not ").append_description_of(self.matcher)
def describe_mismatch(self, item: T, mismatch_description: Description) -> None:
mismatch_description.append_text("but ")
self.matcher.describe_match(item, mismatch_description)
@overload
def _wrap_value_or_type(x: Type) -> Matcher[object]:
...
@overload
def _wrap_value_or_type(x: T) -> Matcher[T]:
...
def _wrap_value_or_type(x):
if is_matchable_type(x):
return instance_of(x)
else:
return wrap_matcher(x)
@overload
def is_not(match: Type) -> Matcher[object]:
...
@overload
def is_not(match: Union[Matcher[T], T]) -> Matcher[T]:
...
def is_not(match):
"""Inverts the given matcher to its logical negation.
:param match: The matcher to negate.
This matcher compares the evaluated object to the negation of the given
matcher. If the ``match`` argument is not a matcher, it is implicitly
wrapped in an :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to
check for equality, and thus matches for inequality.
Examples::
assert_that(cheese, is_not(equal_to(smelly)))
assert_that(cheese, is_not(smelly))
"""
return IsNot(_wrap_value_or_type(match))
def not_(match: Union[Matcher[T], T]) -> Matcher[T]:
"""Alias of :py:func:`is_not` for better readability of negations.
Examples::
assert_that(alist, not_(has_item(item)))
"""
return is_not(match)
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