Add a unit-test for https://github.com/benaadams/Ben.Demystifier/issues/109

test/Ben.Demystifier.Test/TypeNameTests.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Diagnostics;
+using Xunit;
+
+namespace Ben.Demystifier.Test
+{
+    public class TypeNameTests
+    {
+        [Fact]
+        public void NestedGenericTypes()
+        {
+            try
+            {
+                Throw(new Generic<(int, string)>.Nested());
+            }
+            catch (Exception ex)
+            {
+                var text = ex.ToStringDemystified();
+            }
+        }
+
+        public void Throw(Generic<(int a, string b)>.Nested nested) 
+        {
+            throw null;
+        }
+    }
+
+    public class Generic<T> { public struct Nested { } }
+}