test(post): failing test when creating Guid id entities

Author: jaredcnance

test/JsonApiDotNetCoreExampleTests/Acceptance/Spec/CreatingDataTests.cs

@@ -8,6 +8,7 @@
 using JsonApiDotNetCore.Serialization;
 using JsonApiDotNetCore.Services;
 using JsonApiDotNetCoreExample;
+using JsonApiDotNetCoreExample.Data;
 using JsonApiDotNetCoreExample.Models;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.TestHost;
@@ -27,11 +28,57 @@ public CreatingDataTests(DocsFixture<Startup, JsonDocWriter> fixture)
         {
             _fixture = fixture;
             _jsonApiContext = fixture.GetService<IJsonApiContext>();
-             _todoItemFaker = new Faker<TodoItem>()
+            _todoItemFaker = new Faker<TodoItem>()
                 .RuleFor(t => t.Description, f => f.Lorem.Sentence())
                 .RuleFor(t => t.Ordinal, f => f.Random.Number());
         }
 
+        [Fact]
+        public async Task Can_Create_Guid_Identifiable_Entities()
+        {
+            // arrange
+            var builder = new WebHostBuilder()
+                .UseStartup<Startup>();
+            var httpMethod = new HttpMethod("POST");
+            var server = new TestServer(builder);
+            var client = server.CreateClient();
+
+            var context = _fixture.GetService<AppDbContext>();
+
+            var owner = new JsonApiDotNetCoreExample.Models.Person();
+            context.People.Add(owner);
+            await context.SaveChangesAsync();
+
+            var route = "/api/v1/todo-item-collections";
+            var request = new HttpRequestMessage(httpMethod, route);
+            var content = new
+            {
+                data = new
+                {
+                    type = "todo-item-collections"
+                },
+                relationships = new
+                {
+                    owner = new
+                    {
+                        data = new
+                        {
+                            type = "people",
+                            id = owner.Id.ToString()
+                        }
+                    }
+                }
+            };
+            request.Content = new StringContent(JsonConvert.SerializeObject(content));
+            request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.api+json");
+            
+            // act
+            var response = await client.SendAsync(request);
+
+            // assert
+            Assert.Equal(HttpStatusCode.Created, response.StatusCode);
+        }
+
         [Fact]
         public async Task Request_With_ClientGeneratedId_Returns_403()
         {