Add LibraryConnector.Test to see if requests can be made to endpoint.

Tranga/LibraryConnectors/Kavita.cs

@@ -68,6 +68,14 @@ public class Kavita : LibraryConnector
             NetClient.MakePost($"{baseUrl}/api/Library/scan?libraryId={lib.id}", "Bearer", auth, logger);
     }
 
+    internal override bool Test()
+    {
+        foreach (KavitaLibrary lib in GetLibraries())
+            if (NetClient.MakePost($"{baseUrl}/api/Library/scan?libraryId={lib.id}", "Bearer", auth, logger))
+                return true;
+        return false;
+    }
+
     /// <summary>
     /// Fetches all libraries available to the user
     /// </summary>

Tranga/LibraryConnectors/Komga.cs

@@ -32,6 +32,14 @@ public class Komga : LibraryConnector
             NetClient.MakePost($"{baseUrl}/api/v1/libraries/{lib.id}/scan", "Basic", auth, logger);
     }
 
+    internal override bool Test()
+    {
+        foreach (KomgaLibrary lib in GetLibraries())
+            if (NetClient.MakePost($"{baseUrl}/api/v1/libraries/{lib.id}/scan", "Basic", auth, logger))
+                return true;
+        return false;
+    }
+
     /// <summary>
     /// Fetches all libraries available to the user
     /// </summary>

Tranga/LibraryConnectors/LibraryConnector.cs

@@ -30,6 +30,7 @@ public abstract class LibraryConnector : GlobalBase
         this.libraryType = libraryType;
     }
     public abstract void UpdateLibrary();
+    internal abstract bool Test();
 
     protected static class NetClient
     {