public void Combination()
{
var generator = new CombinationGenerator<string>(new[] { "a", "b", "c", "d", "e" }, 2);
var results = generator.ToArray();
string[][] expected = {
new[] { "a", "b" },
new[] { "a", "c" },
new[] { "a", "d" },
new[] { "a", "e" },
new[] { "b", "c" },
new[] { "b", "d" },
new[] { "b", "e" },
new[] { "c", "d" },
new[] { "c", "e" },
new[] { "d", "e" }
};
Assert.AreEqual(expected.Length, results.Length);
Assert.IsTrue(expected.Select((x, i) => x.SequenceEqual(results[i])).All(x => x));
}