@Test
public void distanceInMetersBetween() {

    double delta = 1e-6;
    double longitude1 = 10.01;
    double latitude1 = 11.02;
    double longitude2 = 12.03;
    double latitude2 = 13.04;
    double distanceInMetersBetween = Helper.distanceInMetersBetween(longitude1, latitude1, longitude2, latitude2);
    double expected = 315583.811651;
    assertEquals(expected, distanceInMetersBetween, delta);
}