using AdventOfCode.Extensions;
namespace AdventOfCode.Extensions.Tests;

public class EnumerableExtensionsTest
{
    [Fact]
    public void Combinations_12_2_equals_12_21()
    {
        int[] data = [1, 2];

        var actual = data.Combinations(2).ToArray();

        Assert.Contains([1, 2], actual);
    }
    
    [Fact]
    public void Combinations_123_2_equals_12_13_23()
    {
        int[] data = [1, 2, 3];

        var actual = data.Combinations(2).ToArray();

        Assert.Contains([1, 2], actual);
        Assert.Contains([1, 3], actual);
        Assert.Contains([2, 3], actual);
    }
    
    [Fact]
    public void Combinations_123_3_equals_123()
    {
        int[] data = [1, 2, 3];

        var actual = data.Combinations(3).ToArray();

        Assert.Contains([1, 2, 3], actual);
    }
}