reactive/webflux/hello useJUnitPlatform

reactive/webflux/hello/build.gradle

@@ -16,3 +16,7 @@ dependencies {
 
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 }
+
+tasks.withType(Test).configureEach {
+	useJUnitPlatform()
+}