public void TestCorrectIndexingOfCities()
{
const int readCitiesExpected = 10;
var cities = new Cities();
Assert.AreEqual(readCitiesExpected, cities.ReadCities(CitiesTestFile));;;
City from = cities.FindCity("Mumbai");
City to = cities.FindCity("Istanbul");
List <City> foundCities = cities.FindCitiesBetween(from, to);
// verify that Index property is initialized
int i = 0;
foreach (var city in foundCities)
{
Assert.AreEqual(i, city.Index);
i++;
}
}