Refactor C# projects

csharp.xUnit/GildedRoseTests/ApprovalTest.cs

@@ -0,0 +1,30 @@
+
+using GildedRoseKata;
+
+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
+using VerifyXunit;
+
+using Xunit;
+
+namespace GildedRoseTests
+{
+    public class ApprovalTest
+    {
+        [Fact]
+        public Task ThirtyDays()
+        {
+            var fakeoutput = new StringBuilder();
+            Console.SetOut(new StringWriter(fakeoutput));
+            Console.SetIn(new StringReader("a\n"));
+
+            Program.Main(new string[] { "30" });
+            var output = fakeoutput.ToString();
+
+            return Verifier.Verify(output);
+        }
+    }
+}