Importing the missing ErrorWebFluxAutoConfiguration.

Author: alimate

spring-boot-project/spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -100,7 +100,8 @@ org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
 org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
-org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration
+org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration
 
 # AutoConfigureMockMvc auto-configuration imports
 org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc=\