public void ValidShuffleTest()
{
var daymock = new Mock <IDateTime>();
daymock.Setup(day => day.Now).Returns(DateTime.Now);
DaysShuffler shuffler = new DaysShuffler(appSettings, daymock.Object);
int[] shuffled = shuffler.ShuffleDays();
//without duplication
Assert.Equal(shuffled.Length, shuffled.Distinct().Count());
Assert.Equal(1, shuffled.Min());
Assert.Equal(_days, shuffled.Max());
}
public void ShuffleConsistenceTest()
{
var daymock = new Mock <IDateTime>();
daymock.Setup(day => day.Now).Returns(new DateTime(2019, 01, 25));
DaysShuffler shuffler = new DaysShuffler(appSettings, daymock.Object);
int[] shuffled = shuffler.ShuffleDays();
//System.Index exists : must be written explicitly.
Assert.Equal(shuffler.ShuffleDays(), shuffler.ShuffleDays());
//make sure that not shuffled. very rarely not succeeded.
Assert.NotEqual(shuffled, Enumerable.Range(1, _days).ToArray());
//Different years, different days.
var daymock2 = new Mock <IDateTime>();
daymock2.Setup(day => day.Now).Returns(new DateTime(2020, 12, 12));
DaysShuffler shuffler2 = new DaysShuffler(appSettings, daymock2.Object);
int[] shuffled2 = shuffler2.ShuffleDays();
Assert.NotNull(shuffled2);
Assert.NotEqual(shuffled, shuffled2);
}
