def METHOD_NAME(self, monkeypatch):
    monkeypatch.setattr(requests.sessions.Session, 'post', mock_token_request_factory(token="api1"))
    api1 = OAuth2ClientCredentialsSession("url:example1", "s", "t")
    monkeypatch.setattr(requests.sessions.Session, 'post', mock_token_request_factory(token="api2"))
    api2 = OAuth2ClientCredentialsSession("url:example2", "s", "t")
    assert api1.access_token == "api1"
    assert api2.access_token == "api2"