GildedRoseApprovalTest in C#

ApprovalTest.cs

using GildedRoseKata;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VerifyXunit;
using Xunit;

namespace GildedRoseTests;

public class ApprovalTest
{
    [Fact]
    public Task UpdateQuality()
    {
        var names = new[] { "foo", "Aged Brie", "Backstage passes to a TAFKAL80ETC concert", "Sulfuras, Hand of Ragnaros" };
        var sellIns = new[] { -1, 0, 5, 6, 10, 11 }; 
        var qualitys = new[] { 0, 1, 2, 49, 50 };

        var allCombinations = AllCombinations(DoUpdateQuality,
            names, sellIns, qualitys
        );

        return Verifier.Verify(allCombinations);
    }


    private List<string> AllCombinations(Func<string, int, int, string> theFunction,
        string[] args1, int[] args2, int[] args3)
    {
        var cartesianProduct =
            from arg1 in args1
            from arg2 in args2
            from arg3 in args3
            select new { arg1, arg2, arg3 };

        var result = new List<string>();
        foreach (var combination in cartesianProduct)
        {
            string combinationResult;
            try
            {
                combinationResult = theFunction(combination.arg1, combination.arg2, combination.arg3);
            }
            catch (Exception e)
            {
                combinationResult = e.ToString();
            }

            result.Add($"{combination.arg1}, {combination.arg2}, {combination.arg3} => {combinationResult}");
        }

        return result;
    }

    private string DoUpdateQuality(string name, int sellIn, int quality)
    {
        Item[] items = { new() { Name = name, SellIn = sellIn, Quality = quality } };
        GildedRose app = new GildedRose(items);
        app.UpdateQuality();
        return PrintItem(items[0]);
    }

    public string PrintItem(Item item)
    {
        return $"{item.Name} sellIn: {item.SellIn} quality: {item.Quality}";
    }
}