CSHARP-6017: Add LeftJoin smoke test for net10.0

Author: damieng

tests/SmokeTests/MongoDB.Driver.SmokeTests.Sdk/LeftJoinTests.cs

@@ -0,0 +1,89 @@
+/* Copyright 2010-present MongoDB Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#if NET10_0_OR_GREATER
+
+using System;
+using System.Linq;
+using FluentAssertions;
+using MongoDB.Driver.Core.Configuration;
+using MongoDB.Driver.Linq;
+using Xunit;
+
+namespace MongoDB.Driver.SmokeTests.Sdk
+{
+    [Trait("Category", "Integration")]
+    public class LeftJoinTests
+    {
+        [Fact]
+        public void LeftJoin_returns_matched_and_unmatched_outer_elements()
+        {
+            var client = new MongoClient(InfrastructureUtilities.MongoUri);
+            var database = client.GetDatabase("leftjoin_smoke_" + Guid.NewGuid().ToString("N"));
+
+            try
+            {
+                var orders = database.GetCollection<Order>("orders");
+                var customers = database.GetCollection<Customer>("customers");
+
+                orders.InsertMany(new[]
+                {
+                    new Order { Id = 1, CustomerId = 10 },
+                    new Order { Id = 2, CustomerId = 20 },
+                    new Order { Id = 3, CustomerId = 99 }
+                });
+
+                customers.InsertMany(new[]
+                {
+                    new Customer { Id = 10, Name = "Alice" },
+                    new Customer { Id = 20, Name = "Bob" }
+                });
+
+                var results = orders.AsQueryable()
+                    .LeftJoin(
+                        customers,
+                        o => o.CustomerId,
+                        c => c.Id,
+                        (o, c) => new LeftJoinResult<Order, Customer> { Outer = o, Inner = c })
+                    .OrderBy(r => r.Outer.Id)
+                    .ToList();
+
+                results.Should().HaveCount(3);
+                results[0].Inner.Name.Should().Be("Alice");
+                results[1].Inner.Name.Should().Be("Bob");
+                results[2].Inner.Should().BeNull();
+            }
+            finally
+            {
+                client.DropDatabase(database.DatabaseNamespace.DatabaseName);
+                ClusterRegistry.Instance.UnregisterAndDisposeCluster(client.Cluster);
+            }
+        }
+
+        private class Order
+        {
+            public int Id { get; set; }
+            public int CustomerId { get; set; }
+        }
+
+        private class Customer
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+        }
+    }
+}
+
+#endif