public void Rank_ByDistance_ReturnsExpectedCertainty()
{
var newYork = Coordinates.NewYork();
var entries = new GeoDataEntry[]
{
new GeoDataEntry()
{
Name = "Portland", Latitude = 45.512794, Longitude = -122.679565
}, //2448.63 miles away
new GeoDataEntry()
{
Name = "Chicago", Latitude = 41.881832, Longitude = -87.623177
}, //715.91
new GeoDataEntry()
{
Name = "Paris", Latitude = 48.864716, Longitude = 2.349014
}, //3632.78
new GeoDataEntry()
{
Name = "Buenos Aires", Latitude = -34.603722, Longitude = -58.381592
}
};
var minDistance = entries.Select(r => newYork.DistanceFrom(r.Latitude, r.Longitude)).Min();
foreach (RankingResult result in Target.Rank(entries, null, newYork))
{
var entry = entries.Where(r => r.Equals(result.Entry)).Single();
var expected = Rounder.Round(minDistance / newYork.DistanceFrom(entry));
Assert.AreEqual(expected, result.Certainty);
}
}
