System.Tests.StringTests.Format C# (CSharp) Method

        public static void Format()
        {
            string s = string.Format(null, "0 = {0} 1 = {1} 2 = {2} 3 = {3} 4 = {4}", "zero", "one", "two", "three", "four");
            Assert.Equal("0 = zero 1 = one 2 = two 3 = three 4 = four", s);

            var testFormatter = new TestFormatter();
            s = string.Format(testFormatter, "0 = {0} 1 = {1} 2 = {2} 3 = {3} 4 = {4}", "zero", "one", "two", "three", "four");
            Assert.Equal("0 = Test: : zero 1 = Test: : one 2 = Test: : two 3 = Test: : three 4 = Test: : four", s);
        }