Kotlin + SpringBootTest + Junit 5 + AutoConfigureMockMvc：测试在它应该失败的时候通过了（似乎@BeforeEach 没有生效）

Question

我用 Kotlin 编写了一个非常简单和常见的 CRUD。我想做基本测试，如测试 post、删除、获取和放置。

可能我理解错了：我使用 Beforeach 旨在插入一个寄存器，以便我可以在 get 测试期间进行检查。我没有得到异常，但似乎在 get 测试期间它总是返回 ok 当它应该是 NOT_FOUND 对于任何其他不同于波纹管测试中的 1 的 id。

即使根据我的目的（简单的 CRUD 测试）看到其他不好的做法，任何正确方向的线索或指导都会受到欢迎。

测试

package com.mycomp.jokenpo

import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.mycomp.jokenpo.controller.UserController
import com.mycomp.jokenpo.model.User
import com.mycomp.jokenpo.respository.UserRepository
import com.mycomp.jokenpo.service.UserService
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.mockito.InjectMocks
import org.mockito.Mock
import org.mockito.Mockito.`when`
import org.mockito.MockitoAnnotations
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.boot.test.web.client.TestRestTemplate
import org.springframework.http.HttpStatus
import org.springframework.http.MediaType
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter
import org.springframework.test.context.junit.jupiter.SpringExtension
import org.springframework.test.web.servlet.MockMvc
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
import org.springframework.test.web.servlet.result.MockMvcResultHandlers
import org.springframework.test.web.servlet.result.MockMvcResultMatchers
import org.springframework.test.web.servlet.setup.MockMvcBuilders


@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@ExtendWith(SpringExtension::class)
@AutoConfigureMockMvc
class JokenpoApplicationTests {

    @Autowired
    lateinit var testRestTemplate: TestRestTemplate

    @Autowired
    private lateinit var mvc: MockMvc

    @InjectMocks
    lateinit var controller: UserController

    @Mock
    lateinit var respository: UserRepository

    @Mock
    lateinit var service: UserService

    //private fun <T> any(type: Class<T>): T = Mockito.any<T>(type)

    @BeforeEach
    fun setup() {
        MockitoAnnotations.initMocks(this)
        mvc = MockMvcBuilders.standaloneSetup(controller).setMessageConverters(MappingJackson2HttpMessageConverter()).build()
        `when`(respository.save(User(1, "Test")))
                .thenReturn(User(1, "Test"))

    }

    @Test
    fun createUser() {
        //val created = MockMvcResultMatchers.status().isCreated

        var user = User(2, "Test")
        var jsonData = jacksonObjectMapper().writeValueAsString(user)
        mvc.perform(MockMvcRequestBuilders.post("/users/")
                .contentType(MediaType.APPLICATION_JSON)
                .content(jsonData))
                .andExpect(MockMvcResultMatchers.status().isOk)
                //.andExpect(created)
                .andDo(MockMvcResultHandlers.print())
                .andReturn()
    }

    @Test
    fun findUser() {

        val ok = MockMvcResultMatchers.status().isOk

        val builder = MockMvcRequestBuilders.get("/users?id=99") //no matther which id I type here it returns ok. I would expect only return for 1 based on my @BeforeEach
        this.mvc.perform(builder)
                .andExpect(ok)

    }
}

控制器

package com.mycomp.jokenpo.controller

import com.mycomp.jokenpo.model.User
import com.mycomp.jokenpo.respository.UserRepository
import com.mycomp.jokenpo.service.UserService
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.web.bind.annotation.*
import java.util.concurrent.atomic.AtomicLong
import javax.validation.Valid

@RestController
@RequestMapping("users")
class UserController (private val userService: UserService, private val userRepository: UserRepository){

    val counter = AtomicLong()

//    @GetMapping("/user")
//    fun getUser(@RequestParam(value = "name", defaultValue = "World") name: String) =
//            User(counter.incrementAndGet(), "Hello, $name")

    @GetMapping()
    fun getAllUsers(): List<User> =
            userService.all()

    @PostMapping
    fun add(@Valid @RequestBody user: User): ResponseEntity<User> {
        //user.id?.let { userService.save(it) }
        val savedUser = userService.save(user)
        return ResponseEntity.ok(savedUser)
    }

    @GetMapping("/{id}")
    fun getUserById(@PathVariable(value = "id") userId: Long): ResponseEntity<User> {
        return userRepository.findById(userId).map { user ->
            ResponseEntity.ok(user)
        }.orElse(ResponseEntity.notFound().build())
    }

    @DeleteMapping("/{id}")
    fun deleteUserById(@PathVariable(value = "id") userId: Long): ResponseEntity<Void> {

        return userRepository.findById(userId).map { user  ->
            userRepository.deleteById(user.id)
            ResponseEntity<Void>(HttpStatus.OK)
        }.orElse(ResponseEntity.notFound().build())

    }

//    @DeleteMapping("{id}")
//    fun deleteUserById(@PathVariable id: Long): ResponseEntity<Unit> {
//        if (noteService.existsById(id)) {
//            noteService.deleteById(id)
//            return ResponseEntity.ok().build()
//        }
//        return ResponseEntity.notFound().build()
//    }

    /////

//    @PutMapping("{id}")
//    fun alter(@PathVariable id: Long, @RequestBody user: User): ResponseEntity<User> {
//        return userRepository.findById(userId).map { user  ->
//            userRepository. deleteById(user.id)
//            ResponseEntity<Void>(HttpStatus.OK)
//        }.orElse(ResponseEntity.notFound().build())
//    }

}

存储库

package com.mycomp.jokenpo.respository

import com.mycomp.jokenpo.model.User
import org.springframework.data.repository.CrudRepository

interface UserRepository : CrudRepository<User, Long>

型号

package com.mycomp.jokenpo.model

import javax.persistence.*


@Entity
data class User(
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        val id: Long,

        @Column(nullable = false)
        val name: String
)

gradle 依赖关系

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "2.2.6.RELEASE"
    id("io.spring.dependency-management") version "1.0.9.RELEASE"
    kotlin("jvm") version "1.3.71"
    kotlin("plugin.spring") version "1.3.71"
    kotlin("plugin.jpa") version "1.3.71"
}

group = "com.mycomp"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_1_8

val developmentOnly by configurations.creating
configurations {
    runtimeClasspath {
        extendsFrom(developmentOnly)
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
    implementation("org.springframework.boot:spring-boot-starter-web")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    developmentOnly("org.springframework.boot:spring-boot-devtools")
    runtimeOnly("com.h2database:h2")
    //runtimeOnly("org.hsqldb:hsqldb")
    testImplementation("org.springframework.boot:spring-boot-starter-test") {
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    }
    testImplementation ("com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0")
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "1.8"
    }
}

application.yml

spring:
  datasource:
    url: jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
    username: sa
    password:
    driver-class-name: org.h2.Driver
    platform: h2
  h2:
    console:
      enabled: true
      path: /h2-console #jdbc:h2:mem:testdb

如果有用，可以从 https://github.com/jimisdrpc/games 下载整个项目，但我相信上面的所有文件都足以说明我的问题。

Answer 1

为了解决您的问题，我建议使用 @MockBean，一个可用于向 Spring ApplicationContext.

添加模拟的注释

我将按如下方式重写您的测试（请注意，我正在利用 mockito-kotlin 已经成为您项目的测试依赖项）：

package com.mycomp.jokenpo

import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.mycomp.jokenpo.model.User
import com.mycomp.jokenpo.respository.UserRepository
import com.nhaarman.mockitokotlin2.whenever
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.assertThrows
import org.junit.jupiter.api.extension.ExtendWith
import org.mockito.junit.jupiter.MockitoExtension
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.boot.test.mock.mockito.MockBean
import org.springframework.http.MediaType
import org.springframework.test.context.junit.jupiter.SpringExtension
import org.springframework.test.web.servlet.MockMvc
import org.springframework.test.web.servlet.get
import org.springframework.test.web.servlet.post
import org.springframework.web.util.NestedServletException

@AutoConfigureMockMvc. // auto-magically configures and enables an instance of MockMvc
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
// Why configure Mockito manually when a JUnit 5 test extension already exists for that very purpose?
@ExtendWith(SpringExtension::class, MockitoExtension::class)
class JokenpoApplicationTests {

    @Autowired
    private lateinit var mockMvc: MockMvc

    @MockBean
    lateinit var respository: UserRepository

    @BeforeEach
    fun setup() {
        // use mockito-kotlin for a more idiomatic way of setting up your test expectations
        whenever(respository.save(User(1, "Test"))).thenAnswer {
            it.arguments.first()
        }
    }

    @Test
    fun `Test createUser in the happy path scenario`() {
        val user = User(1, "Test")
        mockMvc.post("/users/") {
            contentType = MediaType.APPLICATION_JSON
            content = jacksonObjectMapper().writeValueAsString(user)
            accept = MediaType.APPLICATION_JSON
        }.andExpect {
            status { isOk }
            content { contentType(MediaType.APPLICATION_JSON) }
            content { json("""{"id":1,"name":"Test"}""") }
        }
        verify(respository, times(1)).save(user)
    }

    @Test
    fun `Test negative scenario of createUser`() {
        val user = User(2, "Test")
        assertThrows<NestedServletException> {
            mockMvc.post("/users/") {
                contentType = MediaType.APPLICATION_JSON
                content = jacksonObjectMapper().writeValueAsString(user)
                accept = MediaType.APPLICATION_JSON
            }
        }
        verify(respository, times(1)).save(user)
    }

    @Test
    fun findUser() {
        mockMvc.get("/users?id=99")
            .andExpect {
                status { isOk }
            }
        verify(respository, times(1)).findAll()
    }
}

话虽如此，这里有一些值得深思的地方：

任何测试都需要包括验证以断言系统在各种类型的场景下都按预期运行，包括负面场景，例如 我们如何检查服务是否无法创建数据库中的新用户记录.
我注意到您的 ApplicationContext (H2) 中已经有一个测试数据库设置，所以为什么不使用它来创建测试记录而不是只是嘲笑存储库层？然后您可以验证数据库是否包含任何新创建的记录。
作为一般规则，我避免在 Kotlin 测试中使用 Mockito（搜索 Whosebug 有几个原因），甚至 mockito-kotlin .现在的最佳实践是结合使用优秀的 MockK 库和 AssertJ 或 assertk 来验证你的期望。

Answer 2

为了运行在以下设置中获得单元测试运行ning:

 - Kotlin 
 - Spring Boot
 - JUnit 5
 - Mockito
 - Gradle

您需要此配置才能开始：

build.gradle.kts

dependencies {
   // ...

   testRuntimeOnly(group = "org.junit.jupiter", name = "junit-jupiter-engine", version = "5.6.3")
   testImplementation(group = "org.mockito", name = "mockito-all", version = "1.10.19")
   testImplementation("org.springframework.boot:spring-boot-starter-test") {
       exclude(group = "org.junit.vin  tage", module = "junit-vintage-engine")
   }

   // ...
}

tasks.withType<Test> {
   useJUnitPlatform()
}

测试文件

@org.springframework.boot.test.context.SpringBootTest
class YourTest {

    @org.mockito.Mock
    lateinit var testingRepo: TestingRepo

    @org.mockito.InjectMocks
    lateinit var testingService: TestingService


    @org.springframework.test.context.event.annotation.BeforeTestMethod
    fun initMocks() {
        org.mockito.MockitoAnnotations.initMocks(this)
    }

    @org.junit.jupiter.api.Test
    fun yourTest() {org.junit.jupiter.api.Assertions.assertTrue(true)}

}

Kotlin + SpringBootTest + Junit 5 + AutoConfigureMockMvc：测试在它应该失败的时候通过了（似乎@BeforeEach 没有生效）

Kotlin + SpringBootTest + Junit 5 + AutoConfigureMockMvc: test passing when it was supposed to fail (seems @BeforeEach not taking effect)

kotlin

spring-test-mvc

springmockito

spring-boot

junit5