be more explicit @ runtime

src/test/appsettings.json

@@ -39,8 +39,8 @@
         }
     },
     "ConnectionStrings": {
-      "Default": "Server=[NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];",
-      "DatabaseCtor":  "Server=[NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];",
-      "Testing":  "Server=[NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];"
+      "Default": "Server=[Default NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];",
+      "DatabaseCtor":  "Server=[Ctor NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];",
+      "Testing":  "Server=[Testing NpgsqlHostName];Port=5432;Database=[DataBase];Username=[Username];Password=[Password];"
    }
 }