System.Linq.Tests.ZipTests.FirstIsNull C# (CSharp) Метод

        public void FirstIsNull()
        {
            IQueryable<int> first = null;
            int[] second = new int[] { 2, 5, 9 };
            Assert.Throws<ArgumentNullException>("source1", () => first.Zip(second.AsQueryable(), (x, y) => x + y));
        }