diff --git a/treasurechest/AssemblyInfo.cs b/treasurechest/AssemblyInfo.cs
new file mode 100644
index 0000000..9506404
--- /dev/null
+++ b/treasurechest/AssemblyInfo.cs
@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly:InternalsVisibleTo("tests")]