internal void Graph_OutEdgesShouldHaveSameTail(GraphDefinitionParameter p)
{
// Arrange
using MutableUndirectedSimpleIncidenceGraph builder = new(p.VertexCount);
foreach (Endpoints endpoints in p.Edges)
{
builder.Add(endpoints.Tail, endpoints.Head);
}
Graph graph = builder.ToGraph();
// Act
for (int vertex = 0; vertex < graph.VertexCount; ++vertex)
{
EdgeEnumerator outEdges = graph.EnumerateOutEdges(vertex);
while (outEdges.MoveNext())
{
Endpoints edge = outEdges.Current;
bool hasTail = graph.TryGetTail(edge, out int tail);
if (!hasTail)
{
Assert.True(hasTail);
}
// Assert
Assert.Equal(vertex, tail);
}
}
}
private static bool TryGetEndpoints(Graph graph, Endpoints edge, out Endpoints endpoints)
{
bool hasTail = graph.TryGetTail(edge, out int tail);
bool hasHead = graph.TryGetHead(edge, out int head);
endpoints = new Endpoints(tail, head);
return(hasTail && hasHead);
}