diff --git a/Vocaluxe/Properties/AssemblyInfo.cs b/Vocaluxe/Properties/AssemblyInfo.cs
index 856b5d45..cc74c35a 100644
--- a/Vocaluxe/Properties/AssemblyInfo.cs
+++ b/Vocaluxe/Properties/AssemblyInfo.cs
@@ -16,6 +16,7 @@
 #endregion
 
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // Allgemeine Informationen über eine Assembly werden über die folgenden 
@@ -52,3 +53,7 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyVersion("SHORTVERSION")]
 [assembly: AssemblyFileVersion("SHORTVERSION")]
 [assembly: AssemblyInformationalVersion("GITVERSION")]
+
+
+// Allow internal access from the Tests project
+[assembly:InternalsVisibleTo("Tests")]
diff --git a/VocaluxeLib/Properties/AssemblyInfo.cs b/VocaluxeLib/Properties/AssemblyInfo.cs
index 60e2dc45..019205d7 100644
--- a/VocaluxeLib/Properties/AssemblyInfo.cs
+++ b/VocaluxeLib/Properties/AssemblyInfo.cs
@@ -16,6 +16,7 @@
 #endregion
 
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // Allgemeine Informationen über eine Assembly werden über die folgenden 
@@ -53,4 +54,7 @@ using System.Runtime.InteropServices;
 // [assembly: AssemblyVersion("1.0.*")]
 
 [assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
\ No newline at end of file
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+// Allow internal access from the Tests project
+[assembly: InternalsVisibleTo("Tests")]
\ No newline at end of file