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[英]Writing unit test for Filter (OncePerRequestFilter) in Spring boot
[英]Spring Boot test Filter
注意:下面的错误实际上是由过滤器中的拼写错误引起的,请参阅@jccampanero 在下面的回答中提到
我一直在尝试几种不同的方法来测试过滤器,但是我不断收到一个或另一个错误,所以我希望有一些方向。
这是一个应该只进行重定向的虚拟过滤器。
package org.example.filters;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class RedirectFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) req;
chain.sendRedirect("/splash");
}
}
还有一个基本的 Spring 引导应用程序 class:
package org.example;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ApplicationClass {
}
我想我只是不清楚我正在尝试做的 Spring 引导测试的“级别”是什么,这是我做过的一些尝试和错误:
选项 1. 尝试使用模拟,例如从这里
package org.example.filters;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import static org.springframework.test.web.servlet.setup.MockMvcBuilders.standaloneSetup;
import org.junit.jupiter.api.Test;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
public class LocaleFilterIntegrationTestStandalone {
@Test
public void whenNoLocaleRedirectToSplash() throws Exception {
standaloneSetup(new TestController()).addFilters(new RedirectFilter()).build().perform(get("/"))
.andExpect(status().isFound()).andExpect(redirectedUrl("/splash"));
}
@Controller
private static class TestController {
@GetMapping("/")
public String get() {
return "got it";
}
}
}
Error: java.lang.ClassCastException: class org.springframework.mock.web.MockHttpServletRequest cannot be cast to class javax.servlet.http.HttpServletResponse
选项 2,尝试使用@WebMvcTest
,它与选项 1 有相同的问题
package org.example.filters;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.stereotype.Controller;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.web.bind.annotation.GetMapping;
@WebMvcTest
public class LocaleFilterIntegrationTestWebMvc {
@Autowired
private MockMvc mvc;
@Test
public void noLanguageShouldRedirectToSplash() throws Exception {
mvc.perform(get("/")).andExpect(status().isFound()).andExpect(redirectedUrl("/splash"));
}
@Controller
private static class TestController {
@GetMapping("/")
public String get() {
return "got it";
}
}
}
Error: java.lang.ClassCastException: class org.springframework.mock.web.MockHttpServletRequest cannot be cast to class javax.servlet.http.HttpServletResponse
选项 3,尝试启动整个上下文,我认为这是能够转换为HttpServletRequest
所必需的:
package org.example.filters;
import java.net.URI;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class LocaleFilterIntegrationTest {
@LocalServerPort
private int port;
@Autowired
private TestRestTemplate restTemplate;
@Test
public void noLanguageShouldRedirectToSplash() throws Exception {
URI uri = new URI("http", "localhost:" + port, "/", null, null);
String result = restTemplate.getForObject(uri.toString(), String.class);
// not sure how, but test for redirect...
}
@Controller
private static class TestController {
@GetMapping("/")
public String get() {
return "got it";
}
}
}
Error: class org.apache.catalina.connector.RequestFacade cannot be cast to class javax.servlet.http.HttpServletResponse
@m-deinem 建议的选项 4
package org.example.filters;
import org.junit.jupiter.api.Test;
import org.springframework.mock.web.MockFilterChain;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
public class LocaleFilterIntegrationTestPlain {
private final RedirectFilter redirectFilter = new RedirectFilter();
@Test
public void noLanguageShouldRedirectToSplash() throws Exception {
MockHttpServletRequest req = new MockHttpServletRequest();
MockHttpServletResponse res = new MockHttpServletResponse();
MockFilterChain chain = new MockFilterChain();
redirectFilter.doFilter(req, res, chain);
}
}
Error: java.lang.ClassCastException: class org.springframework.mock.web.MockHttpServletRequest cannot be cast to class javax.servlet.http.HttpServletResponse
首先,您的RedirectFilter
包含一个错误,它尝试将传入的HttpServletRequest
转换为HttpServletResponse
,因为您使用了错误的变量。
@Component
public class RedirectFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
res.sendRedirect("/splash");
}
}
这两行都使用req
而后者应该使用res
(这也是异常字面上告诉你的)。
接下来只需编写一个简单的单元测试,通过尝试编写集成测试使事情变得过于复杂。
public class RedirectFilterTest
private final RedirectFilter filter = new RedirectFilter();
@Test
public void redirectTest() {
MockHttpServletRequest req = new MockHttpServletRequest();
MockHttpServletResponse res = new MockHttpServletResponse();
MockFilterChain chain = new MockFilterChain();
filter.doFilter(req, res, chain);
assertEquals("/splash", res.getRedirectedUrl());
}
请,也许这只是一个错字,但请注意,在您的RedirectFilter
doFilter
方法中,您错误地将变量req
转换为HttpServletResponse
:
package org.example.filters;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class RedirectFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
// Please, note the incorrect cast
HttpServletResponse response = (HttpServletResponse) req;
chain.sendRedirect("/splash");
}
}
相反,它应该是:
package org.example.filters;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class RedirectFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
chain.sendRedirect("/splash");
}
}
这很可能是ClassCastException
和测试失败的原因。
解决后,@M 提出的解决方案。 Deinum 是一个非常好的和直接的。
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