public void ReadAndWriteUnknownPropertyTypeEntity() { var connection = TestConfiguration.GetConnection(); var dbSet = new MongoDbSet <UnknownPropertyTypeModel>(); dbSet.SetConnection(connection); var entities = new[] { new UnknownPropertyTypeModel(), new UnknownPropertyTypeModel { UnknownItem = new UnknownPropertyTypeChildModel { Description = "UnknownPropertyTypeChildModel" } }, new UnknownPropertyTypeModel { UnknownItem = new Dictionary <string, int> { { "Age", 1 } } } }; dbSet.AddRange(entities); dbSet.SaveChanges(); ResetMongoDb(); dbSet = new MongoDbSet <UnknownPropertyTypeModel>(); dbSet.SetConnection(connection); var dbEntities = dbSet.ToArray(); Assert.IsNull(dbEntities[0].UnknownItem); Assert.IsInstanceOfType(dbEntities[1].UnknownItem, typeof(UnknownPropertyTypeChildModel)); Assert.IsInstanceOfType(dbEntities[2].UnknownItem, typeof(Dictionary <string, object>)); }