public void CheckAndFlip()
{
// Arrange.
Initialize();
CreateT_D();
// Act.
Triangulation.CheckAndFlip(T, new System.Collections.Generic.HashSet <Triangle>());
// Assert.
var tribs = T.Ribs.Any(r => r.Points.Contains(A) && r.Points.Contains(B));
tribs &= T.Ribs.Any(r => r.Points.Contains(B) && r.Points.Contains(D));
tribs &= T.Ribs.Any(r => r.Points.Contains(A) && r.Points.Contains(D));
tribs &= T.Vertices.Count() == 3;
var t_dribs = T_D.Ribs.Any(r => r.Points.Contains(C) && r.Points.Contains(D));
t_dribs &= T_D.Ribs.Any(r => r.Points.Contains(A) && r.Points.Contains(C));
t_dribs &= T_D.Ribs.Any(r => r.Points.Contains(A) && r.Points.Contains(D));
t_dribs &= T_D.Vertices.Count() == 3;
Assert.IsTrue(tribs);
Assert.IsTrue(t_dribs);
}
