CSHARP-1555: Verify that issue is not present in LINQ3. (#838)

Author: rstam

tests/MongoDB.Driver.Tests/Linq/Linq3ImplementationTests/Jira/CSharp1555Tests.cs

@@ -0,0 +1,101 @@
+/* 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.Linq;
+using FluentAssertions;
+using MongoDB.Bson.Serialization.Attributes;
+using Xunit;
+
+namespace MongoDB.Driver.Tests.Linq.Linq3ImplementationTests.Jira
+{
+    public class CSharp1555Tests : Linq3IntegrationTest
+    {
+        [Fact]
+        public void Queryable_should_work()
+        {
+            var collection = CreatePeopleCollection();
+            var queryable = collection.AsQueryable();
+
+            var stages = Translate(collection, queryable);
+            AssertStages(stages, new string[0]);
+
+            var result = queryable.ToList().Single();
+            result.ShouldBeEquivalentTo(new Person { Id = 1, Name = "A" });
+        }
+
+        [Fact]
+        public void Select_new_Person_should_work()
+        {
+            var collection = CreatePeopleCollection();
+            var queryable = collection.AsQueryable()
+                .Select(p => new Person { Id = p.Id, Name = p.Name });
+
+            var stages = Translate(collection, queryable);
+            AssertStages(stages, "{ $project : { _id : '$_id', Name : '$Name' } }");
+
+            var result = queryable.ToList().Single();
+            result.ShouldBeEquivalentTo(new Person { Id = 1, Name = "A" });
+        }
+
+        [Fact]
+        public void Select_new_Person_without_Name_should_work()
+        {
+            var collection = CreatePeopleCollection();
+            var queryable = collection.AsQueryable()
+                .Select(p => new Person { Id = p.Id });
+
+            var stages = Translate(collection, queryable);
+            AssertStages(stages, "{ $project : { _id : '$_id' } }");
+
+            var result = queryable.ToList().Single();
+            result.ShouldBeEquivalentTo(new Person { Id = 1, Name = null });
+        }
+
+        [Fact]
+        public void Select_new_Person_without_Id_should_work()
+        {
+            var collection = CreatePeopleCollection();
+            var queryable = collection.AsQueryable()
+                .Select(p => new Person { Name = p.Name });
+
+            var stages = Translate(collection, queryable);
+            AssertStages(stages, "{ $project : { Name : '$Name', _id : 0 } }");
+
+            var result = queryable.ToList().Single();
+            result.ShouldBeEquivalentTo(new Person { Id = 0, Name = "A" });
+        }
+
+        private IMongoCollection<Person> CreatePeopleCollection()
+        {
+            var collection = GetCollection<Person>();
+
+            var documents = new[]
+            {
+                new Person { Id = 1, Name = "A" }
+            };
+            CreateCollection(collection, documents);
+
+            return collection;
+        }
+
+        private class Person
+        {
+            [BsonIgnoreIfNull]
+            public int Id { get; set; }
+            [BsonIgnoreIfNull]
+            public string Name { get; set; }
+        }
+    }
+}