CSHARP-4332: Verify that the examples work in LINQ3 to the extent possible.

Author: rstam

tests/MongoDB.Driver.Tests/Linq/Linq3ImplementationTests/Jira/CSharp4332Tests.cs

@@ -0,0 +1,160 @@
+/* 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 NET6_0_OR_GREATER // because tests use readonly record struct
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using FluentAssertions;
+using MongoDB.Bson;
+using MongoDB.Bson.Serialization;
+using MongoDB.Bson.Serialization.Attributes;
+using MongoDB.Bson.Serialization.Serializers;
+using MongoDB.Driver.Linq;
+using Xunit;
+
+namespace MongoDB.Driver.Tests.Linq.Linq3ImplementationTests.Jira
+{
+    public class CSharp4332Tests : Linq3IntegrationTest
+    {
+        private static readonly (Expression<Func<Document, bool>> Predicate, string ExpectedFilter)[] __testCases;
+
+        static CSharp4332Tests()
+        {
+            var guid = Guid.Parse("0102030405060708090a0b0c0d0e0f10");
+            var invoiceId = new InvoiceId(guid);
+            var guidNullable = (Guid?)guid;
+            var invoiceIdNullable = (InvoiceId?)invoiceId;
+
+            __testCases = new (Expression<Func<Document, bool>> Predicate, string ExpectedFilter)[]
+            {
+                (c => c.Guid == guid, "{ Guid : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.GuidNullable == guid, "{ GuidNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.Guid == invoiceId, "{ Guid : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.GuidNullable == invoiceId, "{ GuidNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceId == invoiceId, "{ InvoiceId : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceIdNullable == invoiceId, "{ InvoiceIdNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+
+                (c => c.Guid == guidNullable, "{ Guid : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.GuidNullable == guidNullable, "{ GuidNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.Guid == invoiceIdNullable, "{ Guid : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.GuidNullable == invoiceIdNullable, "{ GuidNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceId == invoiceIdNullable, "{ InvoiceId : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceIdNullable == invoiceIdNullable, "{ InvoiceIdNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+
+                (c => c.InvoiceId == new InvoiceId(guidNullable.Value), "{ InvoiceId : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceIdNullable == (guidNullable.HasValue ? new InvoiceId(guidNullable.Value) : null), "{ InvoiceIdNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceId == new InvoiceId(guid), "{ InvoiceId : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+                (c => c.InvoiceIdNullable == new InvoiceId(guid), "{ InvoiceIdNullable : '01020304-0506-0708-090a-0b0c0d0e0f10' }"),
+            };
+        }
+
+        [Theory]
+        [MemberData(nameof(GetTestCases))]
+        public void Where_expression_should_work(string predicateAsString, string expectedFilter, int i)
+        {
+            var collection = CreateCollection();
+            var predicate = __testCases[i].Predicate;
+
+            var queryable = collection.AsQueryable().Where(predicate);
+
+            var stages = Translate(collection, queryable);
+            var filter = stages.Single()["$match"];
+            filter.Should().Be(expectedFilter);
+
+            var results = queryable.ToList();
+            results.Single().Id.Should().Be(1);
+        }
+
+        public static IEnumerable<object[]> GetTestCases()
+        {
+            for (var i = 0; i < __testCases.Length; i++)
+            {
+                var predicateAsString = __testCases[0].Predicate.ToString();
+                var expectedFilter = __testCases[i].ExpectedFilter;
+                yield return new object[] { predicateAsString, expectedFilter, i };
+            }
+        }
+
+        private IMongoCollection<Document> CreateCollection()
+        {
+            var collection = GetCollection<Document>("C") ;
+
+            var guid = Guid.Parse("0102030405060708090a0b0c0d0e0f10");
+            var invoiceId = new InvoiceId(guid);
+            var guidNullable = (Guid?)guid;
+            var invoiceIdNullable = (InvoiceId?)invoiceId;
+
+            CreateCollection(
+                collection,
+                new Document
+                {
+                    Id = 1,
+                    Guid = guid,
+                    GuidNullable = guidNullable,
+                    InvoiceId = invoiceId,
+                    InvoiceIdNullable = invoiceIdNullable
+                });
+
+            return collection;
+        }
+
+        public class Document
+        {
+            public int Id { get; set; }
+
+            [BsonRepresentation(BsonType.String)]
+            public Guid Guid { get; set; }
+
+            [BsonRepresentation(BsonType.String)]
+            public Guid? GuidNullable { get; set; }
+
+            public InvoiceId InvoiceId { get; set; }
+            public InvoiceId? InvoiceIdNullable { get; set; }
+        }
+
+        [BsonSerializer(typeof(InvoiceIdSerializer))]
+        public readonly record struct InvoiceId(Guid Value)
+        {
+            public static implicit operator Guid(InvoiceId s) => s.Value;
+        }
+
+        public class InvoiceIdSerializer : SerializerBase<InvoiceId>
+        {
+            public override InvoiceId Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
+            {
+                if (context.Reader.CurrentBsonType == BsonType.Null)
+                {
+                    context.Reader.ReadNull();
+                    return default;
+                }
+
+                if (Guid.TryParse(context.Reader.ReadString(), out var guid))
+                {
+                    return new InvoiceId(guid);
+                }
+
+                return new InvoiceId(default);
+            }
+
+            public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, InvoiceId value)
+            {
+                context.Writer.WriteString(value.Value.ToString());
+            }
+        }
+    }
+}
+#endif