public virtual void TileToPixelTest()
 {
     foreach (int tileSize in TILE_SIZES)
     {
         Assert.AreEqual(0, MercatorProjection.TileToPixel(0, tileSize));
         Assert.AreEqual(tileSize, MercatorProjection.TileToPixel(1, tileSize));
         Assert.AreEqual(tileSize * 2, MercatorProjection.TileToPixel(2, tileSize));
     }
 }