public void FourVerticesGraphConnectedVertexForZeroVertex()
{
var graph = new AdjacencyListGraph(4)
.AddArrow(0, 1)
.AddArrow(0, 2)
.AddArrow(1, 0)
.AddArrow(0, 3);
var expectedVertices = new[] { 1, 2, 3 };
var actualVertices = graph.GetConnectedVertices(0);
Assert.That(actualVertices, Is.EqualTo(expectedVertices));
}