public void CalculatesDistance()
{
var stop1 = new Stop("Krakow", 19.96f, 50.06f);
var stop2 = new Stop("Warsaw", 21.02f, 52.26f);
double distance = stop1.DistanceTo(stop2);
const double expectedDistance = 255732;
Assert.True(Math.Abs(distance - expectedDistance) <= 2000.0);
}