System.Linq.Tests.SelectTests.Select_SourceIsArray_ElementAtOrDefault C# (CSharp) Method

        public void Select_SourceIsArray_ElementAtOrDefault()
        {
            var source = new[] { 1, 2, 3, 4 }.Select(i => i * 2);
            for (int i = 0; i != 4; ++i)
                Assert.Equal(i * 2 + 2, source.ElementAtOrDefault(i));
            Assert.Equal(0, source.ElementAtOrDefault(-1));
            Assert.Equal(0, source.ElementAtOrDefault(4));
            Assert.Equal(0, source.ElementAtOrDefault(40));

            Assert.Equal(6, source.Skip(1).ElementAtOrDefault(1));
            Assert.Equal(0, source.Skip(2).ElementAtOrDefault(9));
        }