gilded-rose-dotnet-core/test/AgedBrieTest.cs

using System.Collections.Generic;
using Xunit;

namespace csharpcore
{
    public class AgedBrieTest
    {
        [Theory]
        [MemberData(nameof(AgedBrieData))]
        public void ShouldIncreaseQuality(int sellIn, int quality, int expectedQuality)
        {
            var item = new Item {Name = "Aged Brie", SellIn = sellIn, Quality = quality};
            var app = new GildedRose(new List<Item> {item});
            
            app.UpdateQuality();
            Assert.Equal("Aged Brie", item.Name);
            Assert.Equal(sellIn - 1, item.SellIn);
            Assert.Equal(expectedQuality, item.Quality);
        }

        public static object[][] AgedBrieData => new[]
        {
            /* sellIn, quality, expectedQuality*/
            new object[]{ 1, 1, 2 },
            new object[]{ 0, 1, 3 },
            new object[]{ -1, 1, 3 },
        };

        [Theory]
        [InlineData(1, 0)]
        [InlineData(-1, -2)]
        public void ShouldNotIncreaseQualityMoreThan50(int startSellInDays, int expectedSellInDays)
        {
            var item = new Item {Name = "Aged Brie", SellIn = startSellInDays, Quality = 50};
            var app = new GildedRose(new List<Item> {item});
            
            app.UpdateQuality();
            Assert.Equal("Aged Brie", item.Name);
            Assert.Equal(expectedSellInDays, item.SellIn);
            Assert.Equal(50, item.Quality);
        }
    }
}