System.Linq.Tests.AverageTests.NullableLongFromSelector C# (CSharp) Méthode

        public void NullableLongFromSelector()
        {
            var source = new []
            {
                new { name = "Tim", num = (long?)40L },
                new { name = "John", num = default(long?) },
                new { name = "Bob", num = (long?)30L }
            };
            double? expected = 35;

            Assert.Equal(expected, source.AsQueryable().Average(e => e.num));
        }