public void WhereIdMatchesGuids() { var database = TestConfiguration.GetDatabase(); var dbEntityWriter = new DbEntityWriter <WhereIdMatchesGuidModel>(database); var entityCollection = new DbEntityCollection <WhereIdMatchesGuidModel> { new WhereIdMatchesGuidModel { Description = "1" }, new WhereIdMatchesGuidModel { Description = "2" }, new WhereIdMatchesGuidModel { Description = "3" }, new WhereIdMatchesGuidModel { Description = "4" } }; dbEntityWriter.Write(entityCollection); var collection = TestConfiguration.GetDatabase().GetCollection <WhereIdMatchesGuidModel>("WhereIdMatchesGuidModel"); var underlyingQueryable = collection.AsQueryable(); var queryable = new MongoFrameworkQueryable <WhereIdMatchesGuidModel, WhereIdMatchesGuidModel>(underlyingQueryable); var entityIds = entityCollection.Select(e => e.Id).Take(2); var idMatchQueryable = LinqExtensions.WhereIdMatches(queryable, entityIds); Assert.AreEqual(2, idMatchQueryable.Count()); Assert.IsTrue(idMatchQueryable.ToList().All(e => entityIds.Contains(e.Id))); }