public void GetVertexColor()
{
var graph = new AdjacencyGraph <int, Edge <int> >();
graph.AddVerticesAndEdge(new Edge <int>(1, 2));
var algorithm = new BreadthFirstSearchAlgorithm <int, Edge <int> >(graph);
// Algorithm not run
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
Assert.Throws <VertexNotFoundException>(() => algorithm.GetVertexColor(1));
algorithm.Compute();
Assert.AreEqual(GraphColor.Black, algorithm.GetVertexColor(1));
Assert.AreEqual(GraphColor.Black, algorithm.GetVertexColor(2));
}