public virtual void PixelYToLatitudeTest()
        {
            foreach (int tileSize in TILE_SIZES)
            {
                for (sbyte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel)
                {
                    long   mapSize  = MercatorProjection.GetMapSize(zoomLevel, tileSize);
                    double latitude = MercatorProjection.PixelYToLatitude(0, mapSize);
                    Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);
                    latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor(0, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
                    Assert.AreEqual(MercatorProjection.LATITUDE_MAX, latitude, 0);

                    latitude = MercatorProjection.PixelYToLatitude((float)mapSize / 2, mapSize);
                    Assert.AreEqual(0, latitude, 0);
                    mapSize  = MercatorProjection.GetMapSizeWithScaleFactor(MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
                    latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor((float)mapSize / 2, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
                    Assert.AreEqual(0, latitude, 0);

                    latitude = MercatorProjection.PixelYToLatitude(mapSize, mapSize);
                    Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
                    latitude = MercatorProjection.PixelYToLatitudeWithScaleFactor(mapSize, MercatorProjection.ZoomLevelToScaleFactor(zoomLevel), tileSize);
                    Assert.AreEqual(MercatorProjection.LATITUDE_MIN, latitude, 0);
                }

                VerifyInvalidPixelYToLatitude(-1, (sbyte)0, tileSize);
                VerifyInvalidPixelYToLatitude(tileSize + 1, (sbyte)0, tileSize);
            }
        }
 private static void VerifyInvalidPixelYToLatitude(double pixelY, sbyte zoomLevel, int tileSize)
 {
     try
     {
         MercatorProjection.PixelYToLatitude(pixelY, MercatorProjection.GetMapSize(zoomLevel, tileSize));
         Assert.Fail("pixelY: " + pixelY + ", zoomLevel: " + zoomLevel);
     }
     catch (System.ArgumentException)
     {
         Assert.True(true);
     }
 }