CSHARP-3236: Verify that nested Contains works in LINQ3.

Author: rstam

tests/MongoDB.Driver.Tests/Linq/Linq3ImplementationTests/Jira/CSharp3236Tests.cs

@@ -0,0 +1,82 @@
+/* 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.
+*/
+
+using System.Collections.Generic;
+using System.Linq;
+using FluentAssertions;
+using MongoDB.Driver.Linq;
+using Xunit;
+
+namespace MongoDB.Driver.Tests.Linq.Linq3ImplementationTests.Jira
+{
+    public class CSharp3236Tests : Linq3IntegrationTest
+    {
+        [Fact]
+        public void Select_should_work()
+        {
+            var collection = CreateCollection();
+
+            var queryable = collection
+                .AsQueryable()
+                .Select(p => new
+                {
+                    Id = p.Id,
+                    Comments = p.Comments.Where(c => c.Text.Contains("test"))
+                });
+
+            var stages = Translate(collection, queryable);
+            AssertStages(
+                stages,
+                "{ $project : { Id : '$_id', Comments : { $filter : { input : '$Comments', as : 'c', cond : { $gte : [{ $indexOfCP : ['$$c.Text', 'test'] }, 0] } } }, _id : 0 } }");
+
+            var result = queryable.Single();
+            result.Id.Should().Be(1);
+            result.Comments.Select(c => c.Id).Should().Equal(1, 3);
+        }
+
+        private IMongoCollection<Post> CreateCollection()
+        {
+            var collection = GetCollection<Post>("C");
+
+            CreateCollection(
+                collection,
+                new Post
+                {
+                    Id = 1,
+                    Comments = new List<Comment>
+                    {
+                        new Comment { Id = 1, Text = "this is a test comment" },
+                        new Comment { Id = 2, Text = "this is not" },
+                        new Comment { Id = 3, Text = "and this is another test comment" }
+                    }
+                });
+
+            return collection;
+        }
+
+        private class Post
+        {
+            public int Id { get; set; }
+            public List<Comment> Comments { get; set; }
+
+        }
+
+        public class Comment
+        {
+            public int Id { get; set; }
+            public string Text { get; set; }
+        }
+    }
+}