@Get("/unhandled3")
        public AggregatedHttpResponse unhandled3() throws Exception {
            throw new IllegalAccessException();
        }
This uses {@link ArmeriaAutoConfiguration} for integration tests.
application-autoConfTest.yml will be loaded with minimal settings to make it work.
spring/boot3-autoconfigure/src/test/java/com/linecorp/armeria/spring/ArmeriaAutoConfigurationTest.java