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@Test
fun `buy two book should 10 percent discount`() {
    val book1 = Book("1", 100)
    val book2 = Book("2", 100)
    cart.addBook(book1)
    cart.addBook(book2)
    priceShouldBe(180)
}

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class ShoppingCartTest {
    private val cart = ShoppingCart()

    @Test
    fun `buy one book should no discount`() {
        val book = Book("1", 100)
        cart.addBook(book)
        priceShouldBe(100)
    }

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@Test
 fun `buy one book should no discount`() {
     val cart = ShoppingCart()
     cart.addBook(Book("1", 100))
     Assert.assertEquals(100, cart.calculateTotalPrice())
 }

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@Test
fun `calculateTotalPrice() should return 180 when 2 books are added`() {
    val cart = ShoppingCart()
    cart.addBook(Book("1", 100))
    cart.addBook(Book("2", 100))
    assert(cart.calculateTotalPrice() == 180)
}

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@Test
fun `calculateTotalPrice() should return 180 when 2 books are added`() {
    val cart = ShoppingCart()
    cart.addBook(Book("1", 100))
    cart.addBook(Book("2", 80))
    assert(cart.calculateTotalPrice() == 180)
}

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@Test
fun `calculateTotalPrice() should return 100 when 1 book is added`() {
    val cart = ShoppingCart()
    cart.addBook(Book("1", 100))
    assert(cart.calculateTotalPrice() == 100)
}

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@Test
fun `calculateTotalPrice() should return 0 when no book is added`() {
    val cart = ShoppingCart()
    assert(cart.calculateTotalPrice() == 0)
}

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class ShoppingCart {
    private val books = mutableListOf<Book>()

    fun addBook(book: Book) {
        books.add(book)
    }

    fun calculateTotalPrice(): Int {
        if (books.count() >= 3) {
            return (books.sumOf { it.price } * 0.8).toInt()

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/**
 *計算購物車總金額
* 300元以上打八折
* 200元以上打七折
*/
fun calculateTotalPrice(): Int {
    val prices = books.sumOf { it.price }
    var discount = 1.0
    if (prices >= 300) {

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//add glide dependency
implementation 'com.github.bumptech.glide:glide:4.12.0'