public void HowTo01()
{
SpreadsheetViewStub stub = new SpreadsheetViewStub();
Controller controller = new Controller(stub);
stub.FireFileChosenEvent("../../demo1.ss");
Assert.AreEqual("../../demo1.ss", stub.Title);
stub.FireHowToEvent();
Assert.IsTrue(stub.CalledHowTo);
Assert.IsTrue(stub.CalledMessage);
}