public void FlipRequired() { // Arrange. Initialize(); CreateT_D(); // Act. Triangle outFlip; var isRequiredBefore = Triangulation.FlipRequired(T, out outFlip); Triangulation.Flip(T, T_D); var isRequiredAfter = Triangulation.FlipRequired(T, out outFlip); // Assert. Assert.IsTrue(isRequiredBefore); Assert.IsFalse(isRequiredAfter); }