Inheritance: MessageManager
        public void Setup()
        {
            m_EmptyMgr = new TestMessageManager();

            m_ComplexMgr = new TestMessageManager();
            m_ComplexMgr.AddOrAppendError(p0, node0.objectId, e0);
            m_ComplexMgr.AddOrAppendError(p0, node0.objectId, e1);
            m_ComplexMgr.AddOrAppendError(p0, node1.objectId, e2);
            m_ComplexMgr.AddOrAppendError(p1, node0.objectId, e1);
            m_ComplexMgr.AddOrAppendError(p1, node1.objectId, e0);
            m_ComplexMgr.AddOrAppendError(p1, node1.objectId, e1);
            m_ComplexMgr.AddOrAppendError(p1, node2.objectId, e3);
        }