spring-boot - 对于@SpringBootTest @TestConfiguration 类的@Import 什么都不做，而@ContextConfiguration 按预期覆盖

Question

考虑以下集成测试注释：

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE,
                properties = "spring.main.allow-bean-definition-overriding=true")
@ContextConfiguration(classes = {WorkerTestConfig.class})
//@Import(value = {WorkerTestConfig.class})
@ActiveProfiles({"dev","test"})
public class NumberServiceITest {

WorkestTestConfig 的作用是在集成启动期间覆盖真正的 bean/bean 集，每当我使用@ContextConfiguration真正的 bean 并使用来自 WorkerTestConfig 的 bean 时，每当我使用@Import真正的 bean 时，仍然会创建并通过测试。

WorkerTestConfig本身是尽可能微不足道的：

@TestConfiguration
public class WorkerTestConfig {

    @Primary
    @Bean
    public ScheduledExecutorService taskExecutor() {
        return DirectExecutorFactory.createSameThreadExecutor();
    }
}

谁能解释@SpringBootTest注释的另一个神奇行为？如果您重现相同的行为，请确认以便我可以去问题跟踪器，因为我已经看到人们在 SO 上使用@Importwith@SpringBootTest并且在 Spring Boot 文档中没有任何禁止它： https ://docs.spring.io/spring-boot/ docs/current/reference/html/boot-features-testing.html#boot-features-testing-spring-boot-applications- exclude-config

完全不知道发生了什么。

版本：2.1.2.RELEASE

更新：

还尝试删除真正的 bean 以查看问题是否只是覆盖，但@Import注释只是死在水中，不起作用 -> 甚至无法创建 bean，@ContextConfiguration 具有附加/覆盖行为，导入在全部。注释的完全限定导入是：import org.springframework.context.annotation.Import；

也试图从改变@TestConfiguration到@Configuration只是为了它，根本没有。死的。

更新 2：

虽然@Import适用于标准弹簧测试：

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = {Some.class,
                                 Some2WhichDependsOnWorkerTestConfig.class})

@Import(WorkerTestConfig.class)
@ActiveProfiles("test")
public class SomeOtherTest {

标签： spring-bootspring-boot-test

Answer 1

@Import未定义在测试中使用类时处理它们的顺序。添加测试功能的@Import主要目的是允许轻松注册其他bean，无意将其用于替换bean 定义。

如果您想深入了解杂草并确切了解发生了什么，您可以打开ConfigurationClassParser并在doProcessConfigurationClass. 添加以下条件代码：

System.err.println(configClass);
return false;

现在，如果您调试应用程序，您将在处理配置类时获得附加输出。

当您使用classes不带注释的属性时，@Import您会看到：

ConfigurationClass: beanName 'demoImportBugApplication', com.example.demoimportbug.DemoImportBugApplication
ConfigurationClass: beanName 'original', class path resource [com/example/demoimportbug/first/Original.class]
ConfigurationClass: beanName 'workerConfig', class path resource [com/example/demoimportbug/first/WorkerConfig.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/scheduling/annotation/ProxyAsyncConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/scheduling/annotation/ProxyAsyncConfiguration.class]
ConfigurationClass: beanName 'someTestSecondConfiguration', com.example.demoimportbug.second.SomeTestSecondConfiguration
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/context/PropertyPlaceholderAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/task/TaskExecutionAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/CacheAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/GenericCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/SimpleCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/NoOpCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/context/ConfigurationPropertiesAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/info/ProjectInfoAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/task/TaskSchedulingAutoConfiguration.class]

当您使用@Import没有classes属性的情况下，您将获得：

ConfigurationClass: beanName 'org.springframework.boot.test.context.ImportsContextCustomizer$ImportsConfiguration', org.springframework.boot.test.context.ImportsContextCustomizer$ImportsConfiguration
ConfigurationClass: beanName 'null', class path resource [com/example/demoimportbug/first/SomeFirstUsingSecondConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [com/example/demoimportbug/second/SomeTestSecondConfiguration.class]
ConfigurationClass: beanName 'demoImportBugApplication', com.example.demoimportbug.DemoImportBugApplication
ConfigurationClass: beanName 'original', class path resource [com/example/demoimportbug/first/Original.class]
ConfigurationClass: beanName 'workerConfig', class path resource [com/example/demoimportbug/first/WorkerConfig.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/scheduling/annotation/ProxyAsyncConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/scheduling/annotation/ProxyAsyncConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/context/PropertyPlaceholderAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/task/TaskExecutionAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/CacheAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/GenericCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/SimpleCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/cache/NoOpCacheConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/context/ConfigurationPropertiesAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/info/ProjectInfoAutoConfiguration.class]
ConfigurationClass: beanName 'null', class path resource [org/springframework/boot/autoconfigure/task/TaskSchedulingAutoConfiguration.class]

第一个版本WorkerConfig在之前加载，SomeTestSecondConfiguration而第二个版本SomeTestSecondConfiguration在之前加载WorkerConfig。

您还会注意到第二个版本有一个ImportsContextCustomizer$ImportsConfiguration触发额外导入的类。

如果您看一下，SpringBootTestContextBootstrapper您可以在getOrFindConfigurationClasses方法中看到定义了排序，并且您的附加测试类将始终列在主要配置之后。

tl;dr 如果您需要定义的排序，请使用该classes属性。如果你想添加额外的 bean 并且你不想覆盖任何东西，请使用@Import.

您可能还想看看@MockBean哪个提供了一种更强大的方法来用模拟替换 bean。