Fixed a failing test.

Sine we're now importing the ErrorWebFluxAutoConfiguration,
 we have to register the custom exception handler with a
 more priority, in order to keep previous tests green.

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/reactive/webclient/ExampleWebExceptionHandler.java

@@ -18,6 +18,8 @@
 import reactor.core.publisher.Mono;
 
 import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Component;
 import org.springframework.web.server.ServerWebExchange;
@@ -30,6 +32,7 @@
  * @author Ali Dehghani
  */
 @Component
+@Order(Ordered.HIGHEST_PRECEDENCE)
 public class ExampleWebExceptionHandler implements WebExceptionHandler {
 
 	@Override