Moving Join tests.

Ix.NET/Source/System.Interactive.Async.Tests/AsyncTests.Multiple.cs

@@ -13,273 +13,5 @@ namespace Tests
 {
     public partial class AsyncTests
     {
-        [Fact]
-        public void Join_Null()
-        {
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(null, AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), null, x => x, x => x, (x, y) => x));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), null, x => x, (x, y) => x));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, null, (x, y) => x));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, null));
-
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(null, AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x, EqualityComparer<int>.Default));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), null, x => x, x => x, (x, y) => x, EqualityComparer<int>.Default));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), null, x => x, (x, y) => x, EqualityComparer<int>.Default));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, null, (x, y) => x, EqualityComparer<int>.Default));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, null, EqualityComparer<int>.Default));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x, default(IEqualityComparer<int>)));
-        }
-
-        [Fact]
-        public void Join1()
-        {
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 3, 6, 4 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            HasNext(e, 0 + 3);
-            HasNext(e, 0 + 6);
-            HasNext(e, 1 + 4);
-            NoNext(e);
-        }
-
-        [Fact]
-        public void Join2()
-        {
-            var xs = new[] { 3, 6, 4 }.ToAsyncEnumerable();
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            HasNext(e, 3 + 0);
-            HasNext(e, 6 + 0);
-            HasNext(e, 4 + 1);
-            NoNext(e);
-        }
-
-        [Fact]
-        public void Join3()
-        {
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 3, 6 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            HasNext(e, 0 + 3);
-            HasNext(e, 0 + 6);
-            NoNext(e);
-        }
-
-        [Fact]
-        public void Join4()
-        {
-            var xs = new[] { 3, 6 }.ToAsyncEnumerable();
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            HasNext(e, 3 + 0);
-            HasNext(e, 6 + 0);
-            NoNext(e);
-        }
-
-        [Fact]
-        public void Join5()
-        {
-            var ex = new Exception("Bang!");
-            var xs = AsyncEnumerable.Throw<int>(ex);
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
-        }
-
-        [Fact]
-        public void Join6()
-        {
-            var ex = new Exception("Bang!");
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = AsyncEnumerable.Throw<int>(ex);
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
-        }
-
-        [Fact]
-        public void Join7()
-        {
-            var ex = new Exception("Bang!");
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => { throw ex; }, y => y, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
-        }
-
-        [Fact]
-        public void Join8()
-        {
-            var ex = new Exception("Bang!");
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x, y => { throw ex; }, (x, y) => x + y);
-
-            var e = res.GetAsyncEnumerator();
-            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
-        }
-
-        [Fact]
-        public void Join9()
-        {
-            var ex = new Exception("Bang!");
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-
-            var res = xs.Join<int, int, int, int>(ys, x => x, y => y, (x, y) => { throw ex; });
-
-            var e = res.GetAsyncEnumerator();
-            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
-        }
-
-        [Fact]
-        public async Task Join10()
-        {
-            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
-            var ys = new[] { 3, 6, 4 }.ToAsyncEnumerable();
-
-            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
-
-            await SequenceIdentity(res);
-        }
-
-
-        [Fact]
-        public void Join11()
-        {
-            var customers = new List<Customer>
-            {
-                new Customer {CustomerId = "ALFKI"},
-                new Customer {CustomerId = "ANANT"},
-                new Customer {CustomerId = "FISSA"}
-            };
-            var orders = new List<Order>
-            {
-                new Order { OrderId = 1, CustomerId = "ALFKI"},
-                new Order { OrderId = 2, CustomerId = "ALFKI"},
-                new Order { OrderId = 3, CustomerId = "ALFKI"},
-                new Order { OrderId = 4, CustomerId = "FISSA"},
-                new Order { OrderId = 5, CustomerId = "FISSA"},
-                new Order { OrderId = 6, CustomerId = "FISSA"},
-            };
-
-            var asyncResult = customers.ToAsyncEnumerable()
-                                       .Join(orders.ToAsyncEnumerable(), c => c.CustomerId, o => o.CustomerId,
-                                            (c, o) => new CustomerOrder { CustomerId = c.CustomerId, OrderId = o.OrderId });
-
-            var e = asyncResult.GetAsyncEnumerator();
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 1 });
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 2 });
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 3 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 4 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 5 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 6 });
-            NoNext(e);
-        }
-
-        [Fact]
-        public void Join12()
-        {
-            var customers = new List<Customer>
-            {
-                new Customer {CustomerId = "ANANT"},
-                new Customer {CustomerId = "ALFKI"},
-                new Customer {CustomerId = "FISSA"}
-            };
-            var orders = new List<Order>
-            {
-                new Order { OrderId = 1, CustomerId = "ALFKI"},
-                new Order { OrderId = 2, CustomerId = "ALFKI"},
-                new Order { OrderId = 3, CustomerId = "ALFKI"},
-                new Order { OrderId = 4, CustomerId = "FISSA"},
-                new Order { OrderId = 5, CustomerId = "FISSA"},
-                new Order { OrderId = 6, CustomerId = "FISSA"},
-            };
-
-            var asyncResult = customers.ToAsyncEnumerable()
-                                       .Join(orders.ToAsyncEnumerable(), c => c.CustomerId, o => o.CustomerId,
-                                            (c, o) => new CustomerOrder { CustomerId = c.CustomerId, OrderId = o.OrderId });
-
-            var e = asyncResult.GetAsyncEnumerator();
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 1 });
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 2 });
-            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 3 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 4 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 5 });
-            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 6 });
-            NoNext(e);
-        }
-
-        public class Customer
-        {
-            public string CustomerId { get; set; }
-        }
-
-        public class Order
-        {
-            public int OrderId { get; set; }
-            public string CustomerId { get; set; }
-        }
-
-        [DebuggerDisplay("CustomerId = {CustomerId}, OrderId = {OrderId}")]
-        public class CustomerOrder : IEquatable<CustomerOrder>
-        {
-            public bool Equals(CustomerOrder other)
-            {
-                if (ReferenceEquals(null, other)) return false;
-                if (ReferenceEquals(this, other)) return true;
-                return OrderId == other.OrderId && string.Equals(CustomerId, other.CustomerId);
-            }
-
-            public override bool Equals(object obj)
-            {
-                if (ReferenceEquals(null, obj)) return false;
-                if (ReferenceEquals(this, obj)) return true;
-                if (obj.GetType() != this.GetType()) return false;
-                return Equals((CustomerOrder)obj);
-            }
-
-            public override int GetHashCode()
-            {
-                unchecked
-                {
-                    return (OrderId * 397) ^ (CustomerId != null ? CustomerId.GetHashCode() : 0);
-                }
-            }
-
-            public static bool operator ==(CustomerOrder left, CustomerOrder right)
-            {
-                return Equals(left, right);
-            }
-
-            public static bool operator !=(CustomerOrder left, CustomerOrder right)
-            {
-                return !Equals(left, right);
-            }
-
-            public int OrderId { get; set; }
-            public string CustomerId { get; set; }
-        }
     }
 }

Ix.NET/Source/System.Linq.Async.Tests/System/Linq/Operators/Join.cs

@@ -0,0 +1,282 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Tests
+{
+    public class Join : AsyncEnumerableTests
+    {
+        [Fact]
+        public void Join_Null()
+        {
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(null, AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), null, x => x, x => x, (x, y) => x));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), null, x => x, (x, y) => x));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, null, (x, y) => x));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, null));
+
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(null, AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x, EqualityComparer<int>.Default));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), null, x => x, x => x, (x, y) => x, EqualityComparer<int>.Default));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), null, x => x, (x, y) => x, EqualityComparer<int>.Default));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, null, (x, y) => x, EqualityComparer<int>.Default));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, null, EqualityComparer<int>.Default));
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Join<int, int, int, int>(AsyncEnumerable.Return(42), AsyncEnumerable.Return(42), x => x, x => x, (x, y) => x, default(IEqualityComparer<int>)));
+        }
+
+        [Fact]
+        public void Join1()
+        {
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 3, 6, 4 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            HasNext(e, 0 + 3);
+            HasNext(e, 0 + 6);
+            HasNext(e, 1 + 4);
+            NoNext(e);
+        }
+
+        [Fact]
+        public void Join2()
+        {
+            var xs = new[] { 3, 6, 4 }.ToAsyncEnumerable();
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            HasNext(e, 3 + 0);
+            HasNext(e, 6 + 0);
+            HasNext(e, 4 + 1);
+            NoNext(e);
+        }
+
+        [Fact]
+        public void Join3()
+        {
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 3, 6 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            HasNext(e, 0 + 3);
+            HasNext(e, 0 + 6);
+            NoNext(e);
+        }
+
+        [Fact]
+        public void Join4()
+        {
+            var xs = new[] { 3, 6 }.ToAsyncEnumerable();
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            HasNext(e, 3 + 0);
+            HasNext(e, 6 + 0);
+            NoNext(e);
+        }
+
+        [Fact]
+        public void Join5()
+        {
+            var ex = new Exception("Bang!");
+            var xs = AsyncEnumerable.Throw<int>(ex);
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
+        }
+
+        [Fact]
+        public void Join6()
+        {
+            var ex = new Exception("Bang!");
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = AsyncEnumerable.Throw<int>(ex);
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
+        }
+
+        [Fact]
+        public void Join7()
+        {
+            var ex = new Exception("Bang!");
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => { throw ex; }, y => y, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
+        }
+
+        [Fact]
+        public void Join8()
+        {
+            var ex = new Exception("Bang!");
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x, y => { throw ex; }, (x, y) => x + y);
+
+            var e = res.GetAsyncEnumerator();
+            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
+        }
+
+        [Fact]
+        public void Join9()
+        {
+            var ex = new Exception("Bang!");
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+
+            var res = xs.Join<int, int, int, int>(ys, x => x, y => y, (x, y) => { throw ex; });
+
+            var e = res.GetAsyncEnumerator();
+            AssertThrows(() => e.MoveNextAsync().Wait(WaitTimeoutMs), (Exception ex_) => ((AggregateException)ex_).Flatten().InnerExceptions.Single() == ex);
+        }
+
+        [Fact]
+        public async Task Join10()
+        {
+            var xs = new[] { 0, 1, 2 }.ToAsyncEnumerable();
+            var ys = new[] { 3, 6, 4 }.ToAsyncEnumerable();
+
+            var res = xs.Join(ys, x => x % 3, y => y % 3, (x, y) => x + y);
+
+            await SequenceIdentity(res);
+        }
+
+        [Fact]
+        public void Join11()
+        {
+            var customers = new List<Customer>
+            {
+                new Customer {CustomerId = "ALFKI"},
+                new Customer {CustomerId = "ANANT"},
+                new Customer {CustomerId = "FISSA"}
+            };
+            var orders = new List<Order>
+            {
+                new Order { OrderId = 1, CustomerId = "ALFKI"},
+                new Order { OrderId = 2, CustomerId = "ALFKI"},
+                new Order { OrderId = 3, CustomerId = "ALFKI"},
+                new Order { OrderId = 4, CustomerId = "FISSA"},
+                new Order { OrderId = 5, CustomerId = "FISSA"},
+                new Order { OrderId = 6, CustomerId = "FISSA"},
+            };
+
+            var asyncResult = customers.ToAsyncEnumerable()
+                                       .Join(orders.ToAsyncEnumerable(), c => c.CustomerId, o => o.CustomerId,
+                                            (c, o) => new CustomerOrder { CustomerId = c.CustomerId, OrderId = o.OrderId });
+
+            var e = asyncResult.GetAsyncEnumerator();
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 1 });
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 2 });
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 3 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 4 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 5 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 6 });
+            NoNext(e);
+        }
+
+        [Fact]
+        public void Join12()
+        {
+            var customers = new List<Customer>
+            {
+                new Customer {CustomerId = "ANANT"},
+                new Customer {CustomerId = "ALFKI"},
+                new Customer {CustomerId = "FISSA"}
+            };
+            var orders = new List<Order>
+            {
+                new Order { OrderId = 1, CustomerId = "ALFKI"},
+                new Order { OrderId = 2, CustomerId = "ALFKI"},
+                new Order { OrderId = 3, CustomerId = "ALFKI"},
+                new Order { OrderId = 4, CustomerId = "FISSA"},
+                new Order { OrderId = 5, CustomerId = "FISSA"},
+                new Order { OrderId = 6, CustomerId = "FISSA"},
+            };
+
+            var asyncResult = customers.ToAsyncEnumerable()
+                                       .Join(orders.ToAsyncEnumerable(), c => c.CustomerId, o => o.CustomerId,
+                                            (c, o) => new CustomerOrder { CustomerId = c.CustomerId, OrderId = o.OrderId });
+
+            var e = asyncResult.GetAsyncEnumerator();
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 1 });
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 2 });
+            HasNext(e, new CustomerOrder { CustomerId = "ALFKI", OrderId = 3 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 4 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 5 });
+            HasNext(e, new CustomerOrder { CustomerId = "FISSA", OrderId = 6 });
+            NoNext(e);
+        }
+
+        public class Customer
+        {
+            public string CustomerId { get; set; }
+        }
+
+        public class Order
+        {
+            public int OrderId { get; set; }
+            public string CustomerId { get; set; }
+        }
+
+        public class CustomerOrder : IEquatable<CustomerOrder>
+        {
+            public bool Equals(CustomerOrder other)
+            {
+                if (ReferenceEquals(null, other)) return false;
+                if (ReferenceEquals(this, other)) return true;
+                return OrderId == other.OrderId && string.Equals(CustomerId, other.CustomerId);
+            }
+
+            public override bool Equals(object obj)
+            {
+                if (ReferenceEquals(null, obj)) return false;
+                if (ReferenceEquals(this, obj)) return true;
+                if (obj.GetType() != this.GetType()) return false;
+                return Equals((CustomerOrder)obj);
+            }
+
+            public override int GetHashCode()
+            {
+                unchecked
+                {
+                    return (OrderId * 397) ^ (CustomerId != null ? CustomerId.GetHashCode() : 0);
+                }
+            }
+
+            public static bool operator ==(CustomerOrder left, CustomerOrder right)
+            {
+                return Equals(left, right);
+            }
+
+            public static bool operator !=(CustomerOrder left, CustomerOrder right)
+            {
+                return !Equals(left, right);
+            }
+
+            public int OrderId { get; set; }
+            public string CustomerId { get; set; }
+        }
+    }
+}