public void GetMealByTitleTest()
        {
            string name = "雪碧";
            Meal   meal = _mealControl.GetMealByTitle(name);

            Assert.AreEqual(name, meal.Title);
            string newName = "草莓奶昔";

            meal = _mealControl.GetMealByTitle(newName);
            Assert.AreEqual(null, meal);
        }
        // meal item selected
        private void SelectMealItem(object sender, EventArgs e)
        {
            _saveMealButton.Text = SAVE;
            int index = _mealListBox.SelectedIndex;

            if (index >= 0)
            {
                _presentationModel.EnableDeleteMealButton();
                _deleteMealButton.Enabled = _presentationModel.IsDeleteMealEnabled;
                _mealManagerGroupBox.Text = EDIT_MEAL;
                Meal meal = _mealControl.GetMealByTitle(_mealListBox.SelectedItem.ToString());
                _mealNameTextBox.Text           = meal.Title;
                _priceTextBox.Text              = meal.Price;
                _descriptionTextBox.Text        = meal.Description;
                _pathTextBox.Text               = meal.ImagePath;
                _categoryComboBox.SelectedIndex = _categoryComboBox.Items.IndexOf(meal.Category);
            }
        }