ArgsTests.ConsoleStringTests.TestConsoleStringWriteLine C# (CSharp) Метод

        public void TestConsoleStringWriteLine()
        {
            var existingProvider = ConsoleString.ConsoleProvider;
            try
            {
                var testProvider = new TestConsoleProvider();
                ConsoleString.ConsoleProvider = testProvider;
                ConsoleString str = new ConsoleString("Adam");

                bool confirmed = false;

                string written = "";
                string target = "Adam" + Environment.NewLine;
                testProvider.WriteHappened += (s) =>
                {
                    written += s;
                    if (written == target)
                    {
                        confirmed = true;
                    }
                    else
                    {
                        Assert.IsFalse(written.StartsWith(target), "Extra characters after target: '" + written + "'");
                    }

                };

                str.WriteLine();
                Assert.IsTrue(confirmed);
            }
            finally
            {
                ConsoleString.ConsoleProvider = existingProvider;
            }
        }