单元测试 Java API/Http 请求答案

【问题标题】：Unit Test Java API/Http requests单元测试 Java API/Http 请求
【发布时间】：2018-08-28 11:23:37
【问题描述】：

我已经构建了一个 Java API，目前可以将条目添加到 H2 数据库并检索所有条目。我已经根据本教程构建了应用程序：http://www.springboottutorial.com/spring-boot-crud-rest-service-with-jpa-hibernate

这是我写的代码：

Offer.java

package com.java.api.offers.SpringBootOffers.Offer;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Offer {
    @Id
    @GeneratedValue

private int id;
private String description;
private int price;

public Offer(){
    super();
}

public Offer(int id, String description, int price) {
    super();
    this.id = id;
    this.description = description;
    this.price = price;
}

public int getId(){
    return id;
}

public void setId(int id){
    this.id = id;
}

public String getDescription(){
    return description;
}

public void setDescription(String desc){
    this.description = desc;
}

public int getPrice(){
    return price;
}

public void setPrice(int price){
    this.price = price;
}
}

OfferController.java

package com.java.api.offers.SpringBootOffers.Offer;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import java.net.URI;
import java.util.List;

@RestController
public class OfferController {

@Autowired
private OfferRepository offerRepository;

@GetMapping("/offers")
public List<Offer> getAllOffers() {
    return offerRepository.findAll();
}


@PostMapping("/offers")
public ResponseEntity<Object> createStudent(@RequestBody Offer offer) {
    Offer savedOffer = offerRepository.save(offer);

    URI location = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
            .buildAndExpand(savedOffer.getId()).toUri();

    return ResponseEntity.created(location).build();

}

}

OfferRepository.java

package com.java.api.offers.SpringBootOffers.Offer;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface OfferRepository extends JpaRepository<Offer, Long> {};

我现在正在尝试对 GET 和 POST 方法进行单元测试，但是我不确定它是如何工作的。我写了以下测试：

package com.java.api.offers.SpringBootOffers;

import com.java.api.offers.SpringBootOffers.Offer.Offer;
import com.java.api.offers.SpringBootOffers.Offer.OfferController;
import com.java.api.offers.SpringBootOffers.Offer.OfferRepository;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.HttpClientBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.assertj.core.api.Assertions;
import org.springframework.beans.factory.annotation.Autowired;



import java.io.IOException;

@RunWith(SpringRunner.class)
@WebMvcTest(value = OfferController.class)
public class SpringBootOffersApplicationTests {

    @Autowired
    private OfferRepository offerRepository;

    @Test
    public void getAllOffers() throws ClientProtocolException, IOException {

        Offer offer = new Offer();
        HttpUriRequest request = new HttpGet("http://localhost:8080/offers");

        HttpResponse httpResponse = HttpClientBuilder.create().build().execute(request);

        Assertions.assertThat(httpResponse.getStatusLine().getStatusCode()).isEqualTo(HttpStatus.SC_NOT_FOUND);
    }

}

失败并显示以下错误消息：

java.lang.IllegalStateException: Failed to load ApplicationContext

    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
    at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
    at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:44)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'offerController': Unsatisfied dependency expressed through field 'offerRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.java.api.offers.SpringBootOffers.Offer.OfferRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:139)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
    ... 25 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.java.api.offers.SpringBootOffers.Offer.OfferRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1506)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583)
    ... 43 more

我对 Java 还很陌生，所以仍在试图弄清楚如何测试 API，所以任何人都可以帮助解决上述错误消息，或者一般帮助如何正确测试 java 中的 http 方法。

谢谢！

【问题讨论】：

webmvc 测试只会加载测试控制器所需的上下文片段。不是自动装配存储库，而是用 @MockBean 替换它，而是使用模拟对象，您可以使用模拟 API 控制响应
你试过@DataJpaTest吗？
@DarrenForsythe 谢谢，已经通过了测试。那么，接下来，为了控制响应，只需在 POST 测试中添加一个模拟对象？谢谢，
有了 WebMvcTest 是的，您应该（通常）只模拟您需要的依赖项。如果工作量太大，您可以加载其他 bean/配置并在较低级别进行模拟，或者使用返回硬编码而不是响应的测试 bean
这里对您的情况进行了很好的解释：stackoverflow.com/questions/40064988/…

标签： java spring spring-test

【解决方案1】：

我根据@DarranForsythe 的评论更改了答案，并将您的测试源代码更改为 Spring 方式。

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

@RunWith(SpringRunner.class)
@WebMvcTest(value = OfferController.class)
public class SpringBootOffersApplicationTests {

    @MockBean
    private OfferRepository offerRepository;

    @Autowired
    private WebApplicationContext webApplicationContext;

    protected MockMvc mockMvc;

    @Before
    public void setup() throws Exception
    {
        this.mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
    }

    @Test
    public void getAllOffers() throws Exception {

        this.mockMvc.perform(get("/offers"))
            .andExpect(status().is2xxSuccessful())
            .andDo(print());
    }
}

【讨论】：