Assert that the behaviour change of the previous commit is in accorda…

…nce with Newtonsoft.Json deserialization behaviour.

test/Support.NewtonsoftJson.Tests/Assertions.cs

@@ -0,0 +1,43 @@
+using FluentAssertions;
+
+using Newtonsoft.Json;
+
+namespace ExRam.Gremlinq.Support.NewtonsoftJson.Tests
+{
+    public class Assertions
+    {
+        public class VertexProperty
+        {
+            public string? Value { get; set; }
+        }
+
+        public class Vertex
+        {
+            public string? Id { get; set; }
+
+            public VertexProperty? Property { get; set; }
+        }
+
+        [Fact]
+        public void Empty_json_objects_are_deserialized_to_non_null_properties()
+        {
+            JsonConvert
+                .DeserializeObject<Vertex>("{ \"id\": \"Hallo\" }")?
+                .Property
+                .Should()
+                .BeNull();
+
+            JsonConvert
+                .DeserializeObject<Vertex>("{ \"id\": \"Hallo\" }")?
+                .Id
+                .Should()
+                .NotBeNull();
+
+            JsonConvert
+                .DeserializeObject<Vertex>("{ \"id\": \"Hallo\", \"property\": { } }")?
+                .Property
+                .Should()
+                .NotBeNull();
+        }
+    }
+}