diff --git a/.gitignore b/.gitignore
index 95bd72b9..f86e7561 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ obj
 vendor
 .idea
 *.iml
+csharpcore/GildedRoseTests/ApprovalTest.ThirtyDays.received.txt
diff --git a/csharpcore/GildedRoseTests/ApprovalTest.cs b/csharpcore/GildedRoseTests/ApprovalTest.cs
new file mode 100644
index 00000000..db1dc91c
--- /dev/null
+++ b/csharpcore/GildedRoseTests/ApprovalTest.cs
@@ -0,0 +1,29 @@
+using System;
+using System.IO;
+using System.Text;
+using ApprovalTests;
+using ApprovalTests.Reporters;
+using GildedRoseTests;
+using NUnit.Framework;
+
+namespace csharp
+{
+    [UseReporter(typeof(DiffReporter))]
+    [TestFixture]
+    public class ApprovalTest
+    {
+        [Test]
+        public void ThirtyDays()
+        {
+            
+            StringBuilder fakeoutput = new StringBuilder();
+            Console.SetOut(new StringWriter(fakeoutput));
+            Console.SetIn(new StringReader("a\n"));
+
+            TexttestFixture.Main(new string[] { });
+            var output = fakeoutput.ToString();
+
+            Approvals.Verify(output);
+        }
+    }
+}
\ No newline at end of file
diff --git a/csharpcore/GildedRoseTests/GildedRoseTests.csproj b/csharpcore/GildedRoseTests/GildedRoseTests.csproj
index 93a44263..0db31f52 100644
--- a/csharpcore/GildedRoseTests/GildedRoseTests.csproj
+++ b/csharpcore/GildedRoseTests/GildedRoseTests.csproj
@@ -7,7 +7,9 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="ApprovalTests" Version="5.8.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
+        <PackageReference Include="NUnit" Version="3.13.3" />
         <PackageReference Include="xunit" Version="2.4.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
         <PackageReference Include="coverlet.collector" Version="3.1.0" />
diff --git a/csharpcore/GildedRoseTests/TexttestFixture.cs b/csharpcore/GildedRoseTests/TexttestFixture.cs
index cccaf5f9..e95c4e08 100644
--- a/csharpcore/GildedRoseTests/TexttestFixture.cs
+++ b/csharpcore/GildedRoseTests/TexttestFixture.cs
@@ -42,7 +42,7 @@ namespace GildedRoseTests
 
             var app = new GildedRose(Items);
 
-            int days = 2;
+            int days = 31;
             if (args.Length > 0)
             {
                 days = int.Parse(args[0]) + 1;
diff --git a/texttests/config.gr b/texttests/config.gr
index 7183e174..1462cc1b 100755
--- a/texttests/config.gr
+++ b/texttests/config.gr
@@ -21,7 +21,7 @@ diff_program:meld
 #interpreter:ruby
 
 # Settings for the C# version
-#executable:${TEXTTEST_HOME}/GildedRose.exe
+#executable:${TEXTTEST_HOME}/csharp/bin/Debug/csharp.exe
 
 # Settings for the Perl version
 #executable:${TEXTTEST_HOME}/perl/texttest_fixture.pl