diff --git a/Software/E_Libra/BussinessLogicLayer/BussinessLogicLayer.csproj b/Software/E_Libra/BussinessLogicLayer/BussinessLogicLayer.csproj
index 09ccbb5..bd9ca39 100644
--- a/Software/E_Libra/BussinessLogicLayer/BussinessLogicLayer.csproj
+++ b/Software/E_Libra/BussinessLogicLayer/BussinessLogicLayer.csproj
@@ -56,6 +56,7 @@
     <Compile Include="Exceptions\MemberNotFoundException.cs" />
     <Compile Include="Exceptions\NoMoreBookCopiesException.cs" />
     <Compile Include="Exceptions\WrongLibraryException.cs" />
+    <Compile Include="F16\GPTService.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="services\ArchiveServices.cs" />
     <Compile Include="services\BorrowService.cs" />
@@ -82,8 +83,6 @@
       <Name>EntitiesLayer</Name>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="F16\" />
-  </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file
diff --git a/Software/E_Libra/BussinessLogicLayer/F16/GPTService.cs b/Software/E_Libra/BussinessLogicLayer/F16/GPTService.cs
new file mode 100644
index 0000000..cd6e6c6
--- /dev/null
+++ b/Software/E_Libra/BussinessLogicLayer/F16/GPTService.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BussinessLogicLayer.F16
+{
+    public class GPTService
+    {
+        public bool SetSystemMessage(string message)
+        {
+            return true;
+        }
+    }
+}
diff --git a/Software/E_Libra/UnitTesting/Nove funkcionalnosti/F16/GPTService_integrationTest.cs b/Software/E_Libra/UnitTesting/Nove funkcionalnosti/F16/GPTService_integrationTest.cs
index 015271d..c18c67b 100644
--- a/Software/E_Libra/UnitTesting/Nove funkcionalnosti/F16/GPTService_integrationTest.cs	
+++ b/Software/E_Libra/UnitTesting/Nove funkcionalnosti/F16/GPTService_integrationTest.cs	
@@ -1,4 +1,5 @@
-using System;
+using BussinessLogicLayer.F16;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -20,7 +21,7 @@ public void GPTService_SetEmptySystemMessage_Runs()
             var result = gptService.SetSystemMessage("");
 
             //Assert
-            result.Should().Be(true);
+            Assert.True(result);
         }
     }
 }