public double getLongitudeSpan() {
        return this.maxLongitude - this.minLongitude;
    }
@Test
    public void getLongitudeSpanTest() {
        BoundingBox boundingBox = new BoundingBox(MIN_LATITUDE, MIN_LONGITUDE, MAX_LATITUDE, MAX_LONGITUDE);
        Assert.assertEquals(MAX_LONGITUDE - MIN_LONGITUDE, boundingBox.getLongitudeSpan(), 0);
    }