Spring Security+Mock MVC测试断言错误：重定向URL含主机名问题

失败的测试及错误 #

我编写了如下测试：

@Test
@WithAnonymousUser
void givenNoAuthentication_whenEnteringMainPage_thenRedirectToLoginPage() throws Exception {
    mockMvc.perform(get("/")).andExpect(redirectedUrl("/login"));
}

执行后抛出断言错误：

java.lang.AssertionError: Redirected URL expected:</login> but was:<http://localhost/login>
Expected :/login
Actual   :http://localhost/login

正常运行的对比测试 #

另有一个类似测试可正常运行：

@Test
@WithMockUser
void givenAuthentication_whenEnteringLoginPage_thenRedirectToMainPage() throws Exception {
    mockMvc.perform(get("/login")).andExpect(redirectedUrl("/"));
}

我的Spring Security配置 #

配置类代码如下：

@Configuration
public class SecurityConfig {

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity httpSecurity) throws Exception {
        return httpSecurity
            .authorizeHttpRequests(authorize -> authorize
                .requestMatchers("/css/**").permitAll()
                .requestMatchers("/js/**").permitAll()
                .requestMatchers("/login").permitAll()
                .requestMatchers("/register").permitAll()
                .requestMatchers("/user/register").permitAll()
                .anyRequest().authenticated()
            )
            .formLogin(form -> form
                .loginPage("/login")
                .defaultSuccessUrl("/", true)

            )
            .logout(logout -> logout
                .logoutUrl("/logout")
                .logoutSuccessUrl("/login")
            )
            .build();
    }

    @Bean
    public static PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

临时修复方案 #

我通过endsWith方法临时修复了测试：

MvcResult result = mockMvc.perform(get("/")).andReturn();
assertThat(result.getResponse().getRedirectedUrl()).endsWith("/login");

疑问 #

我不理解为什么第一个测试的重定向URL包含主机名http://localhost，而第二个测试的重定向URL只有路径/。

内容的提问来源于stack exchange，提问作者Nerfi