public void ClearOutEdges_Throws() { var wrappedGraph = new AdjacencyGraph <TestVertex, Edge <TestVertex> >(); var graph = new ClusteredAdjacencyGraph <TestVertex, Edge <TestVertex> >(wrappedGraph); // ReSharper disable once AssignNullToNotNullAttribute Assert.Throws <ArgumentNullException>(() => graph.ClearOutEdges(null)); }