SetUp() { m_oGraph = new Graph(); Debug.Assert(m_oGraph.Edges is EdgeCollection); IEdgeCollection oEdgeCollection = m_oGraph.Edges; Debug.Assert(oEdgeCollection.GetEnumerator() is EdgeCollection.Enumerator); m_oEnumerator = (EdgeCollection.Enumerator)oEdgeCollection.GetEnumerator(); Debug.Assert(m_oGraph.Vertices is VertexCollection); m_oVertexCollection = m_oGraph.Vertices; }