public void SortsLargeDescendingEnumerableCorrectly(int thenBys)
{
const int Items = 100_000;
IEnumerable <int> expected = NumberRangeGuaranteedNotCollectionType(0, Items);
IEnumerable <int> unordered = expected.Select(i => Items - i - 1);
System.Linq.IOrderedEnumerable <int> ordered = unordered.OrderBy(_ => 0);
switch (thenBys)
{
case 1: ordered = ordered.ThenByDescending(i => - i); break;
case 2: ordered = ordered.ThenByDescending(i => 0).ThenByDescending(i => - i); break;
case 3: ordered = ordered.ThenByDescending(i => 0).ThenByDescending(i => 0).ThenByDescending(i => - i); break;
}
Assert.Equal(expected, ordered);
}
public void SortsLargeRandomizedEnumerableCorrectly(int thenBys)
{
const int Items = 100_000;
var r = new Random(42);
int[] randomized = Enumerable.Range(0, Items).Select(i => r.Next()).ToArray();
System.Linq.IOrderedEnumerable <int> orderedEnumerable = randomized.OrderBy(_ => 0);
switch (thenBys)
{
case 1: orderedEnumerable = orderedEnumerable.ThenByDescending(i => - i); break;
case 2: orderedEnumerable = orderedEnumerable.ThenByDescending(i => 0).ThenByDescending(i => - i); break;
case 3: orderedEnumerable = orderedEnumerable.ThenByDescending(i => 0).ThenByDescending(i => 0).ThenByDescending(i => - i); break;
}
int[] ordered = orderedEnumerable.ToArray();
Array.Sort(randomized, (a, b) => a - b);
Assert.Equal(randomized, orderedEnumerable);
}
// [Fact]
public void NullSourceComparer()
{
System.Linq.IOrderedEnumerable <int> source = null;
Assert.Throws <ArgumentNullException>("source", () => source.ThenByDescending(i => i, null));
}
public void NullSource()
{
System.Linq.IOrderedEnumerable <int> source = null;
AssertExtensions.Throws <ArgumentNullException>("source", () => source.ThenByDescending(i => i));
}
