public void GivenAListOfTalks_WhenCreatingTheAfternoon_ThenCreateASessionLessThanOrEqualTo240Minutes()
{
var listOfTalks = getListOfTalks();
var factory = new SessionFactory();
var afternoonSession = factory.CreateAfternoonSession(listOfTalks);
Assert.That(afternoonSession.Sum(x => x.Duration), Is.LessThanOrEqualTo(240));
}