public void TestConstructor() {
      TrailVertex vertex = new TrailVertex(
        new Vector3(1.0f, 2.0f, 3.0f), new Vector2(4.0f, 5.0f)
      );

      Assert.AreEqual(1.0f, vertex.Position.X);
      Assert.AreEqual(2.0f, vertex.Position.Y);
      Assert.AreEqual(3.0f, vertex.Position.Z);
      Assert.AreEqual(4.0f, vertex.TextureCoordinate.X);
      Assert.AreEqual(5.0f, vertex.TextureCoordinate.Y);
    }
        public void TestConstructor()
        {
            TrailVertex vertex = new TrailVertex(
                new Vector3(1.0f, 2.0f, 3.0f), new Vector2(4.0f, 5.0f)
                );

            Assert.AreEqual(1.0f, vertex.Position.X);
            Assert.AreEqual(2.0f, vertex.Position.Y);
            Assert.AreEqual(3.0f, vertex.Position.Z);
            Assert.AreEqual(4.0f, vertex.TextureCoordinate.X);
            Assert.AreEqual(5.0f, vertex.TextureCoordinate.Y);
        }