public void OnDisableShould_DeRegisterForSettingsModificationEvents()
        {
            var len = m_Settings.OnModification.GetInvocationList().Length;

            m_Manager.Initialize(m_Settings);
            m_Manager.OnEnable();
            m_Manager.OnEnable();
            m_Manager.OnEnable();
            Assert.Greater(m_Settings.OnModification.GetInvocationList().Length, len);
            m_Manager.OnDisable();
            Assert.AreEqual(len, m_Settings.OnModification.GetInvocationList().Length);
        }