System.Linq.Tests.AverageTests.NullableIntFromSelector C# (CSharp) Method

        public void NullableIntFromSelector()
        {
            var source = new []
            {
                new { name = "Tim", num  = (int?)10 },
                new { name = "John", num =  default(int?) },
                new { name = "Bob", num = (int?)10 }
            };
            double? expected = 10;

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