@Test
public void testDistanceSydneyLondon() {

    double[] sydney = service.getCoordinates(SYDNEY_IP);
    double[] london = service.getCoordinates(LONDON_IP);
    double distanceSydneyToLondonKM = service.distance(sydney, london) / 1000;
    double distanceLondonToSydneyKM = service.distance(london, sydney) / 1000;
    assertEquals(DISTANCE_SYDNEY_LONDON_KM, distanceSydneyToLondonKM, DISTANCE_COMPARISON_DELTA_KM);
    assertEquals(DISTANCE_SYDNEY_LONDON_KM, distanceLondonToSydneyKM, DISTANCE_COMPARISON_DELTA_KM);
}