上一篇《Spring MVC测试框架详解——服务端测试》已经介绍了服务端测试,接下来再看看如果测试Rest客户端,对于客户端测试以前经常使用的方法是启动一个内嵌的jetty/tomcat容器,然后发送真实的请求到相应的控制器;这种方式的缺点就是速度慢;自Spring 3.2开始提供了对RestTemplate的模拟服务器测试方式,也就是说使用RestTemplate测试时无须启动服务器,而是模拟一个服务器进行测试,这样的话速度是非常快的。
2 RestTemplate客户端测试
整个环境在上一篇《Spring MVC测试框架详解——服务端测试》基础上进行构建。
UserRestController控制器
@RestController
@RequestMapping("/users")
public class UserRestController {
private UserService userService;
@Autowired
public UserRestController(UserService userService) {
this.userService = userService;
}
@RequestMapping(value = "/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public User findById(@PathVariable("id") Long id) {
return userService.findById(1L);
}
@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<User> save(@RequestBody User user, UriComponentsBuilder uriComponentsBuilder) {
//save user
user.setId(1L);
MultiValueMap headers = new HttpHeaders();
headers.set("Location", uriComponentsBuilder.path("/users/{id}").buildAndExpand(user.getId()).toUriString());
return new ResponseEntity(user, headers, HttpStatus.CREATED);
}
@RequestMapping(value = "/{id}", method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(HttpStatus.NO_CONTENT)
public void update(@RequestBody User user) {
//update by id
}
@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
public void delete(@PathVariable("id") Long id) {
//delete by id
}
}
2.1 使用内嵌Jetty方式启动容器进行
需要添加jetty依赖:
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
<version>${jetty.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-webapp</artifactId>
<version>${jetty.version}</version>
<scope>test</scope>
</dependency>
如果要测试JSP,请添加
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-jsp</artifactId>
<version>${jetty.version}</version>
<scope>test</scope>
</dependency>
版本:<jetty.version>8.1.8.v20121106</jetty.version>
测试示例(EmbeddedJettyClientTest.java)
public class EmbeddedJettyClientTest extends AbstractClientTest {
private static Server server;
@BeforeClass
public static void beforeClass() throws Exception {
//创建一个server
server = new Server(8080);
WebAppContext context = new WebAppContext();
String webapp = "spring-mvc-test/src/main/webapp";
context.setDescriptor(webapp + "/WEB-INF/web.xml"); //指定web.xml配置文件
context.setResourceBase(webapp); //指定webapp目录
context.setContextPath("/");
context.setParentLoaderPriority(true);
server.setHandler(context);
server.start();
}
@AfterClass
public static void afterClass() throws Exception {
server.stop(); //当测试结束时停止服务器
}
@Test
public void testFindById() throws Exception {
ResponseEntity<User> entity = restTemplate.getForEntity(baseUri + "/{id}", User.class, 1L);
assertEquals(HttpStatus.OK, entity.getStatusCode());
assertThat(entity.getHeaders().getContentType().toString(), containsString(MediaType.APPLICATION_JSON_VALUE));
assertThat(entity.getBody(), hasProperty("name", is("zhang")));
}
//省略其他,请参考github
}
此处通过内嵌Jetty启动一个web容器,然后使用RestTemplate访问真实的uri进行访问,然后进行断言验证。
这种方式的最大的缺点是如果我只测试UserRestController,其他的组件也会加载,属于集成测试,速度非常慢。伴随着Spring Boot项目的发布,我们可以使用Spring Boot进行测试。
2.2 使用Spring Boot进行测试
spring boot请参考spring boot官网 和《Spring Boot——2分钟构建spring web mvc REST风格HelloWorld》进行入门。通过spring boot我们可以只加载某个控制器进行测试。更加方便。
添加spring-boot-starter-web依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring.boot.version}</version>
<scope>test</scope>
</dependency>
版本:<spring.boot.version>0.5.0.BUILD-SNAPSHOT</spring.boot.version>,目前还处于SNAPSHOT版本。
测试示例(SpringBootClientTest.java)
public class SpringBootClientTest extends AbstractClientTest {
private static ApplicationContext ctx;
@BeforeClass
public static void beforeClass() throws Exception {
ctx = SpringApplication.run(Config.class); //启动服务器 加载Config指定的组件
}
@AfterClass
public static void afterClass() throws Exception {
SpringApplication.exit(ctx);//退出服务器
}
@Test
public void testFindById() throws Exception {
ResponseEntity<User> entity = restTemplate.getForEntity(baseUri + "/{id}", User.class, 1L);
assertEquals(HttpStatus.OK, entity.getStatusCode());
assertThat(entity.getHeaders().getContentType().toString(), containsString(MediaType.APPLICATION_JSON_VALUE));
assertThat(entity.getBody(), hasProperty("name", is("zhang")));
}
//省略其他,请参考github
@Configuration
@EnableAutoConfiguration
static class Config {
@Bean
public EmbeddedServletContainerFactory servletContainer() {
return new JettyEmbeddedServletContainerFactory();
}
@Bean
public UserRestController userController() {
return new UserRestController(userService());
}
@Bean
public UserService userService() {
//Mockito请参考 http://stamen.iteye.com/blog/1470066
UserService userService = Mockito.mock(UserService.class);
User user = new User();
user.setId(1L);
user.setName("zhang");
Mockito.when(userService.findById(Mockito.any(Long.class))).thenReturn(user);
return userService;
// return new UserServiceImpl(); //此处也可以返回真实的UserService实现
}
}
}
通过SpringApplication.run启动一个服务器,然后Config.xml是Spring的Java配置方式,此处只加载了UserRestController及其依赖UserService,对于UserService可以通过如Mockito进行模拟/也可以注入真实的实现,Mockito请参考《单元测试系列之2:模拟利器Mockito》。可以通过EmbeddedServletContainerFactory子类指定使用哪个内嵌的web容器(目前支持:jetty/tomcat)。
public class MockServerClientTest extends AbstractClientTest {
private MockRestServiceServer mockServer;
@Before
public void setUp() throws Exception {
super.setUp();
//模拟一个服务器
mockServer = createServer(restTemplate);
}
@Test
public void testFindById() throws JsonProcessingException {
String uri = baseUri + "/{id}";
Long id = 1L;
User user = new User();
user.setId(1L);
user.setName("zhang");
String userJson = objectMapper.writeValueAsString(user);
String requestUri = UriComponentsBuilder.fromUriString(uri).buildAndExpand(id).toUriString();
//添加服务器端断言
mockServer
.expect(requestTo(requestUri))
.andExpect(method(HttpMethod.GET))
.andRespond(withSuccess(userJson, MediaType.APPLICATION_JSON));
//2、访问URI(与API交互)
ResponseEntity<User> entity = restTemplate.getForEntity(uri, User.class, id);
//3.1、客户端验证
assertEquals(HttpStatus.OK, entity.getStatusCode());
assertThat(entity.getHeaders().getContentType().toString(), containsString(MediaType.APPLICATION_JSON_VALUE));
assertThat(entity.getBody(), hasProperty("name", is("zhang")));
//3.2、服务器端验证(验证之前添加的服务器端断言)
mockServer.verify();
}
//省略其他,请参考github
}
测试步骤:
1、准备测试环境
首先创建RestTemplate,然后通过MockRestServiceServer.createServer(restTemplate)创建一个Mock Server,其会自动设置restTemplate的requestFactory为RequestMatcherClientHttpRequestFactory(restTemplate发送请求时都通过ClientHttpRequestFactory创建ClientHttpRequest)。
2、调用API
即restTemplate.getForEntity(uri, User.class, id)访问rest web service;
3、断言验证
3.1、客户端请求断言验证
如mockServer.expect(requestTo(requestUri)).andExpect(method(HttpMethod.GET)):即会验证之后通过restTemplate发送请求的uri是requestUri,且请求方法是GET;
3.2、服务端响应断言验证
首先通过mockServer.andRespond(withSuccess(new ObjectMapper().writeValueAsString(user), MediaType.APPLICATION_JSON));返回给客户端响应信息;
然后restTemplate就可以得到ResponseEntity,之后就可以通过断言进行验证了;
4、 卸载测试环境
对于单元测试步骤请参考:加速Java应用开发速度3——单元/集成测试+CI。
2.4 了解测试API
MockRestServiceServer
用来创建模拟服务器,其提供了createServer(RestTemplate restTemplate),传入一个restTemplate即可创建一个MockRestServiceServer;在createServer中:
MockRestServiceServer mockServer = new MockRestServiceServer();
RequestMatcherClientHttpRequestFactory factory = mockServer.new RequestMatcherClientHttpRequestFactory();
restTemplate.setRequestFactory(factory);
即模拟一个ClientHttpRequestFactory,然后设置回RestTemplate,这样所有发送的请求都会到这个MockRestServiceServer。拿到MockRestServiceServer后,接着就需要添加请求断言和返回响应,然后进行验证。
RequestMatcher/MockRestRequestMatchers
RequestMatcher用于验证请求信息的验证器,即RestTemplate发送的请求的URI、请求方法、请求的Body体内容等等;spring mvc测试框架提供了很多***RequestMatchers来满足测试需求;类似于《Spring MVC测试框架详解——服务端测试》中的***ResultMatchers;注意这些***RequestMatchers并不是ResultMatcher的子类,而是返回RequestMatcher实例的。Spring mvc测试框架为了测试方便提供了MockRestRequestMatchers静态工厂方法方便操作;具体的API如下:
RequestMatcher anything():即请求可以是任何东西;
RequestMatcher requestTo(final Matcher<String> matcher)/RequestMatcher requestTo(final String expectedUri)/RequestMatcher requestTo(final URI uri):请求URI必须匹配某个Matcher/uri字符串/URI;
RequestMatcher method(final HttpMethod method):请求方法必须匹配某个请求方法;
RequestMatcher header(final String name, final Matcher<? super String>... matchers)/RequestMatcher header(final String name, final String... expectedValues):请求头必须匹配某个Matcher/某些值;
ContentRequestMatchers content():获取内容匹配器,然后可以通过如contentType(String expectedContentType)进行ContentType匹配等,具体请参考javadoc;
JsonPathRequestMatchers jsonPath(String expression, Object ... args)/RequestMatcher jsonPath(String expression, Matcher<T> matcher):获取Json路径匹配器/直接进行路径匹配,具体请参考javadoc;
XpathRequestMatchers xpath(String expression, Object... args)/XpathRequestMatchers xpath(String expression, Map<String, String> namespaces, Object... args):获取Xpath表达式匹配器/直接进行Xpath表达式匹配,具体请参考javadoc;
ResponseCreator/MockRestResponseCreators
ResponseCreator用于创建返回给客户端的响应信息,spring mvc提供了静态工厂方法MockRestResponseCreators进行操作;具体的API如下:
DefaultResponseCreator withSuccess() :返回给客户端200(OK)状态码响应;
DefaultResponseCreator withSuccess(String body, MediaType mediaType)/DefaultResponseCreator withSuccess(byte[] body, MediaType contentType)/DefaultResponseCreator withSuccess(Resource body, MediaType contentType):返回给客户端200(OK)状态码响应,且返回响应内容体和MediaType;
DefaultResponseCreator withCreatedEntity(URI location):返回201(Created)状态码响应,并返回响应头“Location=location";
DefaultResponseCreator withNoContent() :返回204(NO_CONTENT)状态码响应;
DefaultResponseCreator withBadRequest() :返回400(BAD_REQUEST)状态码响应;
DefaultResponseCreator withUnauthorizedRequest() :返回401(UNAUTHORIZED)状态码响应;
DefaultResponseCreator withServerError() :返回500(SERVER_ERROR)状态码响应;
DefaultResponseCreator withStatus(HttpStatus status):设置自定义状态码;
对于DefaultResponseCreator还提供了如下API:
DefaultResponseCreator body(String content) /DefaultResponseCreator body(byte[] content)/DefaultResponseCreator body(Resource resource):内容体响应,对于String content 默认是UTF-8编码的;
DefaultResponseCreator contentType(MediaType mediaType) :响应的ContentType;
DefaultResponseCreator location(URI location) :响应的Location头;
DefaultResponseCreator headers(HttpHeaders headers):设置响应头;
2.5 测试示例
测试查找
请参考之前的testFindById;
测试新增
提交JSON数据进行新增
@Test
public void testSaveWithJson() throws Exception {
User user = new User();
user.setId(1L);
user.setName("zhang");
String userJson = objectMapper.writeValueAsString(user);
String uri = baseUri;
String createdLocation = baseUri + "/" + 1;
mockServer
.expect(requestTo(uri)) //验证请求URI
.andExpect(jsonPath("$.name").value(user.getName())) //验证请求的JSON数据
.andRespond(withCreatedEntity(URI.create(createdLocation)).body(userJson).contentType(MediaType.APPLICATION_JSON)); //添加响应信息
restTemplate.setMessageConverters(Arrays.<HttpMessageConverter<?>>asList(new MappingJackson2HttpMessageConverter()));
ResponseEntity<User> responseEntity = restTemplate.postForEntity(uri, user, User.class);
assertEquals(createdLocation, responseEntity.getHeaders().get("Location").get(0));
assertEquals(HttpStatus.CREATED, responseEntity.getStatusCode());
assertEquals(user, responseEntity.getBody());
mockServer.verify();
}
提交XML数据进行新增
@Test
public void testSaveWithXML() throws Exception {
User user = new User();
user.setId(1L);
user.setName("zhang");
ByteArrayOutputStream bos = new ByteArrayOutputStream();
marshaller.marshal(user, new StreamResult(bos));
String userXml = bos.toString();
String uri = baseUri;
String createdLocation = baseUri + "/" + 1;
mockServer
.expect(requestTo(uri)) //验证请求URI
.andExpect(xpath("/user/name/text()").string(user.getName())) //验证请求的JSON数据
.andRespond(withCreatedEntity(URI.create(createdLocation)).body(userXml).contentType(MediaType.APPLICATION_XML)); //添加响应信息
restTemplate.setMessageConverters(Arrays.<HttpMessageConverter<?>>asList(new Jaxb2RootElementHttpMessageConverter()));
ResponseEntity<User> responseEntity = restTemplate.postForEntity(uri, user, User.class);
assertEquals(createdLocation, responseEntity.getHeaders().get("Location").get(0));
assertEquals(HttpStatus.CREATED, responseEntity.getStatusCode());
assertEquals(user, responseEntity.getBody());
mockServer.verify();
}
测试修改
@Test
public void testUpdate() throws Exception {
User user = new User();
user.setId(1L);
user.setName("zhang");
String uri = baseUri + "/{id}";
mockServer
.expect(requestTo(uri)) //验证请求URI
.andExpect(jsonPath("$.name").value(user.getName())) //验证请求的JSON数据
.andRespond(withNoContent()); //添加响应信息
restTemplate.setMessageConverters(Arrays.<HttpMessageConverter<?>>asList(new MappingJackson2HttpMessageConverter()));
ResponseEntity responseEntity = restTemplate.exchange(uri, HttpMethod.PUT, new HttpEntity<>(user), (Class) null, user.getId());
assertEquals(HttpStatus.NO_CONTENT, responseEntity.getStatusCode());
mockServer.verify();
}
测试删除
@Test
public void testDelete() throws Exception {
String uri = baseUri + "/{id}";
Long id = 1L;
mockServer
.expect(requestTo(baseUri + "/" + id)) //验证请求URI
.andRespond(withSuccess()); //添加响应信息
ResponseEntity responseEntity = restTemplate.exchange(uri, HttpMethod.DELETE, HttpEntity.EMPTY, (Class) null, id);
assertEquals(HttpStatus.OK, responseEntity.getStatusCode());
mockServer.verify();
}
通过Mock Server的最大好处是不需要启动服务器,且不需要服务预先存在就可以测试;如果服务已经存在,通过Spring Boot进行测试也是个不错的选择。
再来回顾下测试步骤
1、准备测试环境
首先创建RestTemplate,然后通过MockRestServiceServer.createServer(restTemplate)创建一个Mock Server,其会自动设置restTemplate的requestFactory为RequestMatcherClientHttpRequestFactory(restTemplate发送请求时都通过ClientHttpRequestFactory创建ClientHttpRequest)。
2、调用API
即restTemplate.getForEntity(uri, User.class, id)访问rest web service;
3、断言验证
3.1、客户端请求断言验证
如mockServer.expect(requestTo(requestUri)).andExpect(method(HttpMethod.GET)):即会验证之后通过restTemplate发送请求的uri是requestUri,且请求方法是GET;
3.2、服务端响应断言验证
首先通过mockServer.andRespond(withSuccess(new ObjectMapper().writeValueAsString(user), MediaType.APPLICATION_JSON));返回给客户端响应信息;
然后restTemplate就可以得到ResponseEntity,之后就可以通过断言进行验证了;
4、 卸载测试环境
对于单元测试步骤请参考:加速Java应用开发速度3——单元/集成测试+CI。
测试示例请参考
https://github.com/zhangkaitao/spring4-showcase/tree/master/spring-mvc-test/src/test/java/com/sishuok/mvc/client
欢迎加入spring群134755960进行交流。