Added failing test

Author: joadan

test/Linq2GraphQL.TestClient/Generated/Types/Customer.cs

@@ -14,6 +14,22 @@
 namespace Linq2GraphQL.TestClient;
 
 
+public static class CustomerExtensions
+{
+    [GraphQLMember("relatedCustomers")]
+    public static List<Customer> RelatedCustomers(this Customer  customer, [GraphQLArgument("relationType", "Int!")] int relationType)
+    {
+        return customer.GetMethodValue<List<Customer>>("relatedCustomers", relationType);
+    }
+
+    [GraphQLMember("relatedCustomer")]
+    public static Customer RelatedCustomer(this Customer  customer, [GraphQLArgument("relationType", "Int!")] int relationType)
+    {
+        return customer.GetMethodValue<Customer>("relatedCustomer", relationType);
+    }
+
+}
+
 public partial class Customer : GraphQLTypeBase
 {
     [GraphQLMember("customerId")]
@@ -36,4 +52,16 @@ public partial class Customer : GraphQLTypeBase
     [JsonPropertyName("address")]
     public Address Address { get; set; }
 
+    private LazyProperty<List<Customer>> _relatedCustomers = new();
+    /// <summary>
+    /// Do not use in Query, only to retrive result
+    /// </summary>
+    public List<Customer> RelatedCustomers => _relatedCustomers.Value(() => GetFirstMethodValue<List<Customer>>("relatedCustomers"));
+
+    private LazyProperty<Customer> _relatedCustomer = new();
+    /// <summary>
+    /// Do not use in Query, only to retrive result
+    /// </summary>
+    public Customer RelatedCustomer => _relatedCustomer.Value(() => GetFirstMethodValue<Customer>("relatedCustomer"));
+
 }

test/Linq2GraphQL.TestServer/OrderGrahQLExtensions.cs

@@ -0,0 +1,20 @@
+using Linq2GraphQL.TestServer.Data;
+using Linq2GraphQL.TestServer.Models;
+
+namespace Linq2GraphQL.TestServer
+{
+    [ExtendObjectType(typeof(Customer))]
+    public class OrderGraphQLExtensions
+    {
+        public List<Customer> RelatedCustomers(int relationType)
+        {
+            return SampleData.GetCustomers();
+        }
+
+        public Customer RelatedCustomer(int relationType)
+        {
+            return SampleData.GetCustomers().FirstOrDefault();
+        }
+
+    }
+}

test/Linq2GraphQL.TestServer/Program.cs

@@ -7,6 +7,7 @@
     .AddQueryType<Query>()
     .AddMutationType<Mutation>()
     .AddSubscriptionType<Subscription>()
+    .AddTypeExtension<OrderGraphQLExtensions>()
     .AddType<Pig>()
     .AddType<Spider>()
     .AddFiltering()

test/Linq2GraphQL.Tests/QueryIncludeTests.cs

@@ -25,6 +25,25 @@ public async Task IncludePrimitives()
         Assert.Null(result.First().Address);
     }
 
+    [Fact]
+    public async Task IncludeMethod_MultipleLevels()
+    {
+        var query = sampleClient
+            .Query
+            .Customers()
+       .Include(e => e.Select(c => c.RelatedCustomer(2).Orders.Select(o => o.Address)))
+       .Select();
+
+        var req = await query.GetRequestAsJsonAsync();
+        var result = await query.ExecuteBaseAsync();
+
+        var customer = result.First();
+        Assert.Equal(Guid.Empty, customer.CustomerId);
+
+
+    }
+
+
 
     [Fact]
     public async Task IncludePrimitives_MultipleLevels()