public void WhenIType(string keyPressed)
        {
            var calculator  = ScenarioContext.Current.Get <Application>("subject");
            var entryHelper = new WhiteEntryHelper(calculator);

            entryHelper.PressKey(keyPressed);
        }
        public void WhenIPushTheButton(string buttonValue)
        {
            var calculator  = ScenarioContext.Current.Get <Application>("subject");
            var entryHelper = new WhiteEntryHelper(calculator);

            entryHelper.PushButton(buttonValue);
        }