public void ShowBack_WhenBackSideIsAnEmptyString_ReturnsEmptyString()
        {
            Flashcard flashcard = new Flashcard("wh", string.Empty);
            string    result    = flashcard.ShowBack();

            Assert.That(result, Is.EqualTo(string.Empty));
        }
        public void ShowBack_WhenTheBackSideIsFive_ReturnsFive()
        {
            Flashcard flashcard = new Flashcard("", "five");
            string    result    = flashcard.ShowBack();

            Assert.That(result, Is.EqualTo("five"));
        }