added options factory

server.tests/Options/OptionsFactory.cs

@@ -0,0 +1,15 @@
+using System.Text.Json;
+
+namespace server.tests.Options
+{
+    internal static class OptionsFactory
+    {
+        public static JsonSerializerOptions GetJsonSerializerOptions()
+        {
+            return new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true
+            };
+        }
+    }
+}