public void SetRootVertex()
{
var graph = new AdjacencyGraph <CloneableTestVertex, Edge <CloneableTestVertex> >();
var algorithm = new CloneableVertexGraphExplorerAlgorithm <CloneableTestVertex, Edge <CloneableTestVertex> >(graph);
int rootVertexChangeCount = 0;
algorithm.RootVertexChanged += (_, _) => ++ rootVertexChangeCount;
var vertex1 = new CloneableTestVertex("1");
algorithm.SetRootVertex(vertex1);
Assert.AreEqual(1, rootVertexChangeCount);
algorithm.TryGetRootVertex(out CloneableTestVertex root);
Assert.AreSame(vertex1, root);
// Not changed
algorithm.SetRootVertex(vertex1);
Assert.AreEqual(1, rootVertexChangeCount);
algorithm.TryGetRootVertex(out root);
Assert.AreSame(vertex1, root);
var vertex2 = new CloneableTestVertex("2");
algorithm.SetRootVertex(vertex2);
Assert.AreEqual(2, rootVertexChangeCount);
algorithm.TryGetRootVertex(out root);
Assert.AreSame(vertex2, root);
algorithm.SetRootVertex(vertex1);
Assert.AreEqual(3, rootVertexChangeCount);
algorithm.TryGetRootVertex(out root);
Assert.AreSame(vertex1, root);
}
public void ComputeWithRoot_Throws()
{
var graph = new AdjacencyGraph <CloneableTestVertex, Edge <CloneableTestVertex> >();
var algorithm = new CloneableVertexGraphExplorerAlgorithm <CloneableTestVertex, Edge <CloneableTestVertex> >(graph);
// ReSharper disable once AssignNullToNotNullAttribute
Assert.Throws <ArgumentNullException>(() => algorithm.Compute(null));
Assert.IsFalse(algorithm.TryGetRootVertex(out _));
}