[JAVA] Spring Boot @WebMvcTest test enables Spring Security default security

When using WebFlux and Security with Spring Boot 2.3.4.RELEASE In a test that gives @WebMvcTest for testing a controller etc. When I made a request to the controller with WebTestClient, I was asked for Basic authentication for some reason.

It's a project that uses Spring Security, but it doesn't use Basic authentication.

Although the cause could not be investigated, there was an issue on GitHub.

In summary, @WebFluxTest configures controller-related @Beans such as @Conroller, @ControllerAdvice, and WebFluxConfigurer, but not @Bean of @Service.

However, it seems that the class with @Configuration is generated as @Bean. And it seems that only @Bean that matches the condition is generated from it.

If you have a security configuration for WebFlux of Spring Security, in most cases you will need to prepare the following configuration described in the document.

public class SecurityConfiguration {

    public SecurityWebFilterChain springWebFilterChain(ServerHttpSecurity http) {
        // do stuff

At this time, SecurityWebFilterChain is not generated, but @EnableWebFluxSecurity is scanned together with SecurityConfiguration.

Looking at the definition of @EnableWebFluxSecurity, [@Import (WebFluxSecurityConfiguration.class)](https://github.com/spring-projects/spring-security/blob/651c94b3859eb6c3eee4ee632b1419e59d99d8dd/config/src/main/java/org/springframework /security/config/annotation/web/reactive/EnableWebFluxSecurity.java#L87-L88) is added.

WebFluxSecurityConfiguration will generate the default SecurityWebFilterChain (https://github.com/spring-projects/spring-security/blob/651c94b3859eb6c3eee4ee632b1419e59d99d8dd/config/src/main/java/org/springframework/security/config/annotation" /web/reactive/WebFluxSecurityConfiguration.java#L100-L111).

It seems that the default security of Spring Security is applied to the test with @WebFluxTest in this way.

As a countermeasure, it seems that there is no choice but to explicitly @ Import`` @ Configuration that generates SecurityWebFilterChain prepared in the project.

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