Update existing tests to use new callback

Author: Bart Koelman

test/JsonApiDotNetCoreExampleTests/IntegrationTests/EagerLoading/BuildingRepository.cs

@@ -0,0 +1,25 @@
+using System.Threading;
+using System.Threading.Tasks;
+using JetBrains.Annotations;
+using JsonApiDotNetCore.Configuration;
+using JsonApiDotNetCore.Resources;
+
+namespace JsonApiDotNetCoreExampleTests.IntegrationTests.EagerLoading
+{
+    [UsedImplicitly(ImplicitUseKindFlags.InstantiatedNoFixedConstructorSignature)]
+    public sealed class BuildingResourceDefinition : JsonApiResourceDefinition<Building>
+    {
+        public BuildingResourceDefinition(IResourceGraph resourceGraph)
+            : base(resourceGraph)
+        {
+        }
+
+        public override Task OnInitializeResourceAsync(Building resource, CancellationToken cancellationToken)
+        {
+            // Must ensure that an instance exists for this required relationship, so that POST succeeds.
+            resource.PrimaryDoor = new Door();
+
+            return Task.CompletedTask;
+        }
+    }
+}

test/JsonApiDotNetCoreExampleTests/IntegrationTests/EagerLoading/BuildingResourceDefinition.cs

@@ -2,10 +2,11 @@
 using System.Net.Http;
 using System.Threading.Tasks;
 using FluentAssertions;
-using JsonApiDotNetCore.Configuration;
+using JsonApiDotNetCore.Resources;
 using JsonApiDotNetCore.Serialization.Objects;
 using JsonApiDotNetCoreExampleTests.Startups;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
 using Xunit;
 
@@ -26,7 +27,7 @@ public EagerLoadingTests(ExampleIntegrationTestContext<TestableStartup<EagerLoad
 
             testContext.ConfigureServicesAfterStartup(services =>
             {
-                services.AddResourceRepository<BuildingRepository>();
+                services.AddScoped<IResourceDefinition<Building>, BuildingResourceDefinition>();
             });
         }