Viewing file:  isinstanceof.py (1.23 KB) -rw-r--r--
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from typing import Type
from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.helpers.wrap_matcher import is_matchable_type
from hamcrest.core.matcher import Matcher
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
class IsInstanceOf(BaseMatcher[object]):
def __init__(self, expected_type: Type) -> None:
if not is_matchable_type(expected_type):
raise TypeError("IsInstanceOf requires type")
self.expected_type = expected_type
def _matches(self, item: object) -> bool:
return isinstance(item, self.expected_type)
def describe_to(self, description: Description) -> None:
description.append_text("an instance of ").append_text(self.expected_type.__name__)
def instance_of(atype: Type) -> Matcher[object]:
"""Matches if object is an instance of, or inherits from, a given type.
:param atype: The type to compare against as the expected type.
This matcher checks whether the evaluated object is an instance of
``atype`` or an instance of any class that inherits from ``atype``.
Example::
instance_of(str)
"""
return IsInstanceOf(atype)
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