### Question:
MercatorProjection { public static long pixelXToTileX(double pixelX, byte zoomLevel) { return (long) Math.min(Math.max(pixelX / Tile.TILE_SIZE, 0), Math.pow(2, zoomLevel) - 1); } private  MercatorProjection(); static double calculateGroundResolution(double latitude, byte zoomLevel); static double deltaLat(double deltaPixel, double lat, byte zoom); static long getMapSize(byte zoomLevel); static double latitudeToPixelY(double latitude, byte zoomLevel); static long latitudeToTileY(double latitude, byte zoomLevel); static double longitudeToPixelX(double longitude, byte zoomLevel); static long longitudeToTileX(double longitude, byte zoomLevel); static double pixelXToLongitude(double pixelX, byte zoomLevel); static long pixelXToTileX(double pixelX, byte zoomLevel); static double pixelYToLatitude(double pixelY, byte zoomLevel); static long pixelYToTileY(double pixelY, byte zoomLevel); static double tileXToLongitude(long tileX, byte zoomLevel); static double tileYToLatitude(long tileY, byte zoomLevel); static final double EARTH_CIRCUMFERENCE; static final double LATITUDE_MAX; static final double LATITUDE_MIN; }### Answer:
@Test public void pixelXToTileXTest() { for (byte zoomLevel = ZOOM_LEVEL_MIN; zoomLevel <= ZOOM_LEVEL_MAX; ++zoomLevel) { Assert.assertEquals(0, MercatorProjection.pixelXToTileX(0, zoomLevel)); } }