public void TestDeleteByDish()
{
// Arrange
var dish1 = new Dish(
"Eis",
"Ice cream",
2.0M,
Category.Dessert,
TimeOfDay.Weekdays,
true,
2
);
// Act
var dish2 = crudService.Create(dish1);
Assert.NotNull(dish2);
crudService.DeleteByDish(dish2);
// Assert
var dish3 = crudService.ReadById(dish2.Id);
Assert.Null(dish3);
}