public void calculate_the_value_spent_by_an_smoker(int years, double perDay, double price, double expected)
        {
            // Dado / Setup
            var exercises = new Exercises1();

            // Quando / Ação
            var returnedExercise = exercises.Exercise7(years, perDay, price);

            // Deve / Asserções
            Assert.Equal(expected, returnedExercise);
        }