internal static void Correctness()
{
int count = Environment.ProcessorCount * 4;
int[] source = Enumerable.Range(0, count).ToArray(); // 0 ... 15.
int elementAt = new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.ElementAt(count / 2).WriteLine() // Expected: 8,
.WriteLine(); // Actual: 2.
int first = new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.First() // Expected: 0.
.WriteLine(); // Actual: 3.
int last = new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.Last() // Expected: 15.
.WriteLine(); // Actual: 13.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.Take(count / 2) // Expected: 0 ... 7.
.WriteLines(); // Actual: 3 2 5 7 10 11 14 15.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.Skip(count / 2) // Expected: 8 ... 15.
.WriteLines(); // Actual: 3 0 7 5 11 10 15 14.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.TakeWhile(value => value <= count / 2) // Expected: 0 ... 7.
.WriteLines(); // Actual: 3 5 8.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.SkipWhile(value => value <= count / 2) // Expected: 9 ... 15.
.WriteLines(); // Actual: 1 3 2 13 5 7 6 11 9 10 15 12 14.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.Reverse() // Expected: 15 ... 0.
.WriteLines(); // Actual: 12 8 4 2 13 9 5 1 14 10 6 0 15 11 7 3.
bool sequentialEqual = new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.SequenceEqual(new StaticPartitioner <int>(source).AsParallel()); // Expected: True.
sequentialEqual.WriteLine(); // Actual: False.
new StaticPartitioner <int>(source).AsParallel().Select(value => value + ComputingWorkload())
.Zip(
second: new StaticPartitioner <int>(source).AsParallel(),
resultSelector: (a, b) => $"({a}, {b})") // Expected: (0, 0) ... (15, 15).
.WriteLines(); // Actual: (3, 8) (0, 12) (1, 0) (2, 4) (6, 9) (7, 13) ...
}