Kotlin：如何使用JUnit5和Mockk清理或重置Mock

在某些情况下，需要在测试用例之间清理或重置模拟

将Koling与JUnit5和Mockk一起使用，第一种方法应该如下所示：

class CreateProductsTests {

    @Test
    fun `run() with an existing product should throw a CrudException`() {

        val productRepository = mockk<ProductRepository>()
        val editorService = mockk<EditorService>()
        val sut = CreateProductServiceImpl(productRepository, editorService)

        // Given an editor that return a JSON
        val product = completeTestProduct()
        every { editorService.edit("Create new Product", product) } returns product

        // And the product does exist in the database
        every { productRepository.findById(product.id) } returns Optional.of(product)

        // When we call createProduct()"
        // Then should fail
        val exception = assertFailsWith<CrudException> { sut.createProduct() }
        exception.message shouldBe "The product 'TST' already exists in database"
    }

    @Test
    fun `createProduct() with an invalid product should fail`() {

        val productRepository = mockk<ProductRepository>()
        val editorService = mockk<EditorService>()
        val sut = CreateProductServiceImpl(productRepository, editorService)

        // Given an editor that return a JSON
        val product = completeTestProduct()
        every { editorService.edit("Create new Product", product) } returns product

        // And the product does exist in the database
        every { productRepository.findById(product.id) } returns Optional.of(product)

        // And a repository saves the product
        every { productRepository.save(product) } returns product

        // When we call createProduct()"
        val actual = sut.createProduct()

        // Then it should return the product
        actual shouldBe product

        // And should call once these dependencies
        verify(exactly = 1) {
            editorService.edit(any<String>(), any<Product>())
            productRepository.findById(any<String>())
            productRepository.save(any<Product>())
        }
    }
}

class CreateProductsTests {

    var productRepository = mockk<ProductRepository>()
    var editorService = mockk<EditorService>()
    var sut = CreateProductServiceImpl(productRepository, editorService)

    @BeforeEach
    fun clear() {
        productRepository = mockk<ProductRepository>()
        editorService = mockk<EditorService>()
        sut = CreateProductServiceImpl(productRepository, editorService)
    }
...

是否有更好（更快）的方法一次性声明模拟和sut，并在每次测试中重置或清除所有模拟和sut？您应该尝试：

 @AfterEach
internal fun tearDown() {
    clearAllMocks()
}

---

您可以在每次测试之前初始化mock和sut一次并重置mock，但是您只需要生成测试类的一个实例。这就是它的样子：

@TestInstance(Lifecycle.PER_CLASS)
class CreateProductsTests {

    var productRepository = mockk<ProductRepository>()
    var editorService = mockk<EditorService>()
    var sut = CreateProductServiceImpl(productRepository, editorService)

    @BeforeAll
    fun setup() {
        MockKAnnotations.init(this)
        sut = CreateProductServiceImpl(productRepository, editorService)
    }

    @BeforeEach
    fun clear() {
        clearMocks(productRepository, editorService)
    }
...

@TestInstance（生命周期每类）
类CreateProductsTests{
var productRepository=mockk（）
var editorService=mockk（）
var sut=CreateProductServiceImpl（productRepository，editorService）
@以前
趣味设置（）{
MockKAnnotations.init（this）
sut=CreateProductServiceImpl（productRepository，editorService）
}
@之前
趣味十足{
clearMocks（产品存储库、编辑器服务）
}
...