protected static void SetTargetVertex_Test <TGraph>(
[NotNull] RootedSearchAlgorithmBase <int, TGraph> algorithm)
where TGraph : IImplicitVertexSet <int>
{
int targetVertexChangeCount = 0;
algorithm.TargetVertexChanged += (sender, args) => ++ targetVertexChangeCount;
const int vertex1 = 0;
algorithm.SetTargetVertex(vertex1);
Assert.AreEqual(1, targetVertexChangeCount);
algorithm.TryGetTargetVertex(out int target);
Assert.AreEqual(vertex1, target);
// Not changed
algorithm.SetTargetVertex(vertex1);
Assert.AreEqual(1, targetVertexChangeCount);
algorithm.TryGetTargetVertex(out target);
Assert.AreEqual(vertex1, target);
const int vertex2 = 1;
algorithm.SetTargetVertex(vertex2);
Assert.AreEqual(2, targetVertexChangeCount);
algorithm.TryGetTargetVertex(out target);
Assert.AreEqual(vertex2, target);
algorithm.SetTargetVertex(vertex1);
Assert.AreEqual(3, targetVertexChangeCount);
algorithm.TryGetTargetVertex(out target);
Assert.AreEqual(vertex1, target);
}
protected static void ComputeWithoutRoot_Throws_Test <TGraph>(
[NotNull] IMutableVertexSet <int> graph,
[NotNull, InstantHandle] Func <RootedSearchAlgorithmBase <int, TGraph> > createAlgorithm)
where TGraph : IImplicitVertexSet <int>
{
RootedSearchAlgorithmBase <int, TGraph> algorithm = createAlgorithm();
Assert.Throws <InvalidOperationException>(algorithm.Compute);
// Source (and target) vertex set but not to a vertex in the graph
const int vertex1 = 1;
algorithm = createAlgorithm();
algorithm.SetRootVertex(vertex1);
algorithm.SetTargetVertex(vertex1);
Assert.Throws <VertexNotFoundException>(algorithm.Compute);
const int vertex2 = 2;
graph.AddVertex(vertex1);
algorithm = createAlgorithm();
algorithm.SetRootVertex(vertex1);
algorithm.SetTargetVertex(vertex2);
Assert.Throws <VertexNotFoundException>(algorithm.Compute);
}
protected static void ClearTargetVertex_Test <TVertex, TGraph>(
[NotNull] RootedSearchAlgorithmBase <TVertex, TGraph> algorithm)
where TVertex : new()
where TGraph : IImplicitVertexSet <TVertex>
{
int targetVertexChangeCount = 0;
// ReSharper disable once AccessToModifiedClosure
algorithm.TargetVertexChanged += (sender, args) => ++ targetVertexChangeCount;
algorithm.ClearTargetVertex();
Assert.AreEqual(0, targetVertexChangeCount);
var vertex = new TVertex();
SetTargetVertex(vertex);
algorithm.ClearTargetVertex();
Assert.AreEqual(1, targetVertexChangeCount);
algorithm.ClearTargetVertex();
Assert.AreEqual(1, targetVertexChangeCount);
#region Local function
void SetTargetVertex(TVertex v)
{
algorithm.SetTargetVertex(v);
targetVertexChangeCount = 0;
}
#endregion
}
protected static void SetTargetVertex_Throws_Test <TVertex, TGraph>(
[NotNull] RootedSearchAlgorithmBase <TVertex, TGraph> algorithm)
where TVertex : class
where TGraph : IImplicitVertexSet <TVertex>
{
// ReSharper disable once AssignNullToNotNullAttribute
Assert.Throws <ArgumentNullException>(() => algorithm.SetTargetVertex(null));
}
protected static void TryGetTargetVertex_Test <TVertex, TGraph>(
[NotNull] RootedSearchAlgorithmBase <TVertex, TGraph> algorithm)
where TVertex : new()
where TGraph : IImplicitVertexSet <TVertex>
{
Assert.IsFalse(algorithm.TryGetTargetVertex(out _));
var vertex = new TVertex();
algorithm.SetTargetVertex(vertex);
Assert.IsTrue(algorithm.TryGetTargetVertex(out TVertex target));
AssertEqual(vertex, target);
}