Viewing file:  isdict_containingkey.py (1.79 KB) -rw-r--r--
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from typing import Any, Hashable, Mapping, TypeVar, Union
from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.helpers.hasmethod import hasmethod
from hamcrest.core.helpers.wrap_matcher import wrap_matcher
from hamcrest.core.matcher import Matcher
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
K = TypeVar("K", bound=Hashable)
class IsDictContainingKey(BaseMatcher[Mapping[K, Any]]):
def __init__(self, key_matcher: Matcher[K]) -> None:
self.key_matcher = key_matcher
def _matches(self, item: Mapping[K, Any]) -> bool:
if hasmethod(item, "keys"):
for key in item.keys():
if self.key_matcher.matches(key):
return True
return False
def describe_to(self, description: Description) -> None:
description.append_text("a dictionary containing key ").append_description_of(
self.key_matcher
)
def has_key(key_match: Union[K, Matcher[K]]) -> Matcher[Mapping[K, Any]]:
"""Matches if dictionary contains an entry whose key satisfies a given
matcher.
:param key_match: The matcher to satisfy for the key, or an expected value
for :py:func:`~hamcrest.core.core.isequal.equal_to` matching.
This matcher iterates the evaluated dictionary, searching for any key-value
entry whose key satisfies the given matcher. If a matching entry is found,
``has_key`` is satisfied.
Any argument that is not a matcher is implicitly wrapped in an
:py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for
equality.
Examples::
has_key(equal_to('foo'))
has_key('foo')
"""
return IsDictContainingKey(wrap_matcher(key_match))
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