public async Task Test_AsString()
{
CShell shell = new CShell();
shell.cd(testFolder);
var result = await shell.Run("cmd", "/c", "echo this is a yo yo").AsString();
Assert.AreEqual("this is a yo yo", result.Trim(), "AsString");
var record = await shell.ReadFile("TestA.txt").AsString();
var text = File.ReadAllText(Path.Combine(testFolder, "TestA.Txt"));
Assert.AreEqual(record, text, "AsString");
}