public void TestFindNeighboursSorted()
{
var cities = new Cities();
cities.ReadCities(citiesTestFile);
var loc = cities[0].Location;
var neighbors = cities.FindNeighboursSorted(loc, 2000).ToArray();
//verify the correct order (sorted by distance)
Assert.AreEqual(4, neighbors.Length);
Assert.AreEqual("Mumbai", neighbors[0].Name);
Assert.AreEqual("Karachi", neighbors[1].Name);
Assert.IsTrue(loc.Distance(neighbors[0].Location) <= loc.Distance(neighbors[1].Location));
Assert.AreEqual("Dilli", neighbors[2].Name);
Assert.IsTrue(loc.Distance(neighbors[1].Location) <= loc.Distance(neighbors[2].Location));
Assert.AreEqual("Dhaka", neighbors[3].Name);
Assert.IsTrue(loc.Distance(neighbors[2].Location) <= loc.Distance(neighbors[3].Location));
}