public void PolygonTest()
{
Polygon p = new Polygon();
Assert.IsTrue(p.IsEmpty());
Assert.AreEqual(0, p.NumInteriorRing);
Assert.AreEqual(p.NumInteriorRing, p.InteriorRings.Count);
Assert.IsFalse(p.Equals(null));
Assert.IsTrue(p.Equals(new Polygon()));
Assert.IsNull(p.GetBoundingBox());
LinearRing ring = new LinearRing();
ring.Vertices.Add(new Point(10, 10));
ring.Vertices.Add(new Point(20, 10));
ring.Vertices.Add(new Point(20, 20));
Assert.IsFalse(ring.IsCCW());
ring.Vertices.Add(new Point(10, 20));
ring.Vertices.Add(ring.Vertices[0].Clone());
Assert.IsTrue(ring.IsPointWithin(new Point(15, 15)));
Assert.AreNotSame(ring.Clone(), ring);
p.ExteriorRing = ring;
Assert.AreEqual(100, p.Area);
LinearRing ring2 = new LinearRing();
ring2.Vertices.Add(new Point(11, 11));
ring2.Vertices.Add(new Point(19, 11));
ring2.Vertices.Add(new Point(19, 19));
ring2.Vertices.Add(new Point(11, 19));
ring2.Vertices.Add(ring2.Vertices[0].Clone());
p.InteriorRings.Add(ring2);
Assert.AreEqual(100 + 64, p.Area);
// Reverse() doesn't exist for Collections
//ring2.Vertices.Reverse();
//Assert.AreEqual(100 - 64, p.Area);
Assert.AreEqual(1, p.NumInteriorRing);
Assert.AreEqual(new BoundingBox(10, 10, 20, 20), p.GetBoundingBox());
Polygon p2 = p.Clone();
Assert.AreEqual(p, p2);
Assert.AreNotSame(p, p2);
p2.InteriorRings.RemoveAt(0);
Assert.AreNotEqual(p, p2);
}