def setUp(self):
        """
        Create a realm, portal, and L{HTTPAuthSessionWrapper} to use in the tests.
        """
        self.username = b'foo bar'
        self.password = b'bar baz'
        self.avatarContent = b"contents of the avatar resource itself"
        self.childName = b"foo-child"
        self.childContent = b"contents of the foo child of the avatar"
        self.checker = InMemoryUsernamePasswordDatabaseDontUse()
        self.checker.addUser(self.username, self.password)
        self.avatar = Data(self.avatarContent, 'text/plain')
        self.avatar.putChild(
            self.childName, Data(self.childContent, 'text/plain'))
        self.avatars = {self.username: self.avatar}
        self.realm = Realm(self.avatars.get)
        self.portal = portal.Portal(self.realm, [self.checker])
        self.credentialFactories = []
        self.wrapper = HTTPAuthSessionWrapper(
            self.portal, self.credentialFactories)

        Create a realm, portal, and L{HTTPAuthSessionWrapper} to use in the tests.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_httpauth.py