    it "raises an AuthenticationFailure exception" do
      session.login "invalid-user", "invalid-password"

      lambda do
        session.command(ping: 1)
      end.should raise_exception(Moped::Errors::AuthenticationFailure)
    end
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.