refactor: ProductDetailPresenterTest 리팩터링 및 수정

app/src/main/java/woowacourse/shopping/view/productdetail/ProductDetailActivity.kt

@@ -51,7 +51,7 @@ class ProductDetailActivity : AppCompatActivity(), ProductDetailContract.View {
 
  private fun setUpPresenter() {
  presenter =
- ProductDetailPresenter(this, CartDbRepository(this), RecentViewedDbRepository(this))
+ ProductDetailPresenter(INITIAL_COUNT, this, CartDbRepository(this), RecentViewedDbRepository(this))
  }
 
  private fun forceQuit() {
@@ -120,6 +120,7 @@ class ProductDetailActivity : AppCompatActivity(), ProductDetailContract.View {
  }
 
  companion object {
+ private const val INITIAL_COUNT = 1
  const val PRODUCT = "PRODUCT"
  const val LAST_VIEWED_PRODUCT = "LAST_VIEWED"
  private const val NOT_EXIST_DATA_ERROR = "데이터가 넘어오지 않았습니다."

app/src/main/java/woowacourse/shopping/view/productdetail/ProductDetailPresenter.kt

@@ -7,11 +7,12 @@ import woowacourse.shopping.domain.RecentViewedRepository
 import woowacourse.shopping.model.ProductModel
 
 class ProductDetailPresenter(
+ initialCount: Int,
  private val view: ProductDetailContract.View,
  private val cartRepository: CartRepository,
  private val recentViewedRepository: RecentViewedRepository,
 ) : ProductDetailContract.Presenter {
- private val _count: MutableLiveData<Int> = MutableLiveData<Int>(1)
+ private val _count: MutableLiveData<Int> = MutableLiveData<Int>(initialCount)
  override val count: LiveData<Int>
  get() = _count
 

app/src/test/java/woowacourse/shopping/ProductDetailPresenterTest.kt

@@ -1,10 +1,11 @@
 package woowacourse.shopping
 
-import io.mockk.every
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
 import io.mockk.mockk
 import io.mockk.verify
 import org.junit.Assert.assertEquals
 import org.junit.Before
+import org.junit.Rule
 import org.junit.Test
 import woowacourse.shopping.domain.CartProduct
 import woowacourse.shopping.domain.CartRepository
@@ -17,6 +18,9 @@ class ProductDetailPresenterTest {
  private lateinit var view: ProductDetailContract.View
  private lateinit var presenter: ProductDetailContract.Presenter
 
+ @get:Rule
+ val instantExecutorRule = InstantTaskExecutorRule()
+
  private val products = mutableListOf(
  CartProduct(
  0,
@@ -59,10 +63,23 @@ class ProductDetailPresenterTest {
  return mProducts
  }
 
+ override fun find(id: Int): CartProduct? {
+ return mProducts.find { it.id == id }
+ }
+
  override fun add(id: Int, count: Int) {
  mProducts.add(CartProduct(id, count))
  }
 
+ override fun update(id: Int, count: Int) {
+ val index = mProducts.indexOfFirst { it.id == id }
+ if (index == -1) {
+ mProducts.add(CartProduct(id, count))
+ return
+ }
+ mProducts[index] = CartProduct(id, count)
+ }
+
  override fun remove(id: Int) {
  mProducts.filter { it.id != id }.toList()
  }
@@ -79,25 +96,24 @@ class ProductDetailPresenterTest {
  @Before
  fun setUp() {
  view = mockk(relaxed = true)
- presenter = ProductDetailPresenter(view, cartRepository, recentViewedRepository)
+ presenter = ProductDetailPresenter(1, view, cartRepository, recentViewedRepository)
  }
 
  @Test
  fun `장바구니 담기 버튼을 클릭하면 장바구니에 상품이 담긴다`() {
- every { view.startCartActivity() } answers { nothing }
-
  val product = ProductModel(
  10,
  "락토핏",
  "https://thumbnail6.coupangcdn.com/thumbnails/remote/230x230ex/image/retail/images/6769030628798948-183ad194-f24c-44e6-b92f-1ed198b347cd.jpg",
  10000,
+ 10
  )
  presenter.putInCart(product)
  val expectedSize = 5
  val actualSize = cartRepository.findAll().size
 
  assertEquals(expectedSize, actualSize)
- verify { view.startCartActivity() }
+ verify { view.finishActivity(true) }
  }
 
  @Test
@@ -110,4 +126,39 @@ class ProductDetailPresenterTest {
 
  assertEquals(expectedSize, actualSize)
  }
+
+ @Test
+ fun `현재 선택한 개수가 1이상 100 미만의 값이라면 개수 증가를 할 수 있다`() {
+ presenter = ProductDetailPresenter(3, view, cartRepository, recentViewedRepository)
+ presenter.plusCount()
+
+ val expectedCount = 4
+ val actualCount = presenter.count.value
+
+ assertEquals(expectedCount, actualCount)
+ }
+
+ @Test
+ fun `현재 선택한 개수가 100이라면 개수 증가를 할 수 없다`() {
+ presenter = ProductDetailPresenter(100, view, cartRepository, recentViewedRepository)
+ presenter.plusCount()
+
+ val expectedCount = 100
+ val actualCount = presenter.count.value
+
+ assertEquals(expectedCount, actualCount)
+ }
+
+
+
+ @Test
+ fun `현재 선택한 개수가 1이라면 개수 감소를 할 수 없다`() {
+ presenter = ProductDetailPresenter(1, view, cartRepository, recentViewedRepository)
+ presenter.minusCount()
+
+ val expectedCount = 1
+ val actualCount = presenter.count.value
+
+ assertEquals(expectedCount, actualCount)
+ }
 }