public void Returns_Empty_Results_When_Given_Empty_List()
{
var ageComparer = new AgeComparer(new List<Person>());
var result = ageComparer.FindClosest();
Assert.Null(result.Person1);
Assert.Null(result.Person2);
}
public void Returns_Empty_Results_When_Given_One_Person()
{
var list = new List<Person>() { person01_Oldest };
var ageComparer = new AgeComparer(list);
var result = ageComparer.FindClosest();
Assert.Null(result.Person1);
Assert.Null(result.Person2);
}
public void Returns_Closest_Two_For_Two_People()
{
var list = new List<Person>() { person01_Oldest, person02_2ndOldest };
var ageComparer = new AgeComparer(list);
var result = ageComparer.FindClosest();
Assert.Same(person01_Oldest, result.Person1);
Assert.Same(person02_2ndOldest, result.Person2);
}
public void FindThrowsNullReferenceException_WhenEmptyList()
{
List<Person> list = new List<Person>(new Person[2]);
AgeComparer ageComparer = new AgeComparer(list);
Assert.Throws<NullReferenceException>(() => ageComparer.FindClosest());
}