fix: public setters to allow testing

Author: maurei

src/JsonApiDotNetCore/Serialization/Client/DeserializedResponse.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using JsonApiDotNetCore.Models;
 using JsonApiDotNetCore.Models.Links;
@@ -8,21 +9,21 @@ namespace JsonApiDotNetCore.Serialization.Client
     /// TODO: Currently <see cref="ResourceLinks"/> and <see cref="RelationshipLinks"/>
     /// information is ignored by the serializer. This is out of scope for now because
     /// it is not considered mission critical for v4.
-    public class DeserializedResponseBase
+    public abstract class DeserializedResponseBase
     {
-        public TopLevelLinks Links { get; internal set; }
-        public Dictionary<string, object> Meta { get; internal set; }
-        public object Errors { get; internal set; }
-        public object JsonApi { get; internal set; }
+        public TopLevelLinks Links { get; set; }
+        public Dictionary<string, object> Meta { get; set; }
+        public object Errors { get; set; }
+        public object JsonApi { get; set; }
     }
 
     /// <summary>
     /// Represents a deserialized document with "single data".
     /// </summary>
     /// <typeparam name="TResource">Type of the resource in the primary data</typeparam>
     public class DeserializedSingleResponse<TResource> : DeserializedResponseBase where TResource : class, IIdentifiable
-    {
-        public TResource Data { get; internal set; }
+    { 
+        public TResource Data { get; set;  }
     }
 
     /// <summary>
@@ -31,6 +32,6 @@ public class DeserializedSingleResponse<TResource> : DeserializedResponseBase wh
     /// <typeparam name="TResource">Type of the resource(s) in the primary data</typeparam>
     public class DeserializedListResponse<TResource> : DeserializedResponseBase where TResource : class, IIdentifiable
     {
-        public List<TResource> Data { get; internal set; }
+        public List<TResource> Data { get; set; }
     }
 }