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from typing import TypeVar
from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.matcher import Matcher
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
T = TypeVar("T")
class IsSame(BaseMatcher[T]):
def __init__(self, obj: T) -> None:
self.object = obj
def _matches(self, item: T) -> bool:
return item is self.object
def describe_to(self, description: Description) -> None:
description.append_text("same instance as ").append_text(hex(id(self.object))).append_text(
" "
).append_description_of(self.object)
def describe_mismatch(self, item: T, mismatch_description: Description) -> None:
mismatch_description.append_text("was ")
if item is not None:
mismatch_description.append_text(hex(id(item))).append_text(" ")
mismatch_description.append_description_of(item)
def same_instance(obj: T) -> Matcher[T]:
"""Matches if evaluated object is the same instance as a given object.
:param obj: The object to compare against as the expected value.
This matcher invokes the ``is`` identity operator to determine if the
evaluated object is the the same object as ``obj``.
"""
return IsSame(obj)