private static Map<String, Object> apiExtensions() {
		Map extensions = new HashMap<String, Object>();

		Map linkedMap = new LinkedHashMap<String, String>();
		linkedMap.put("property1", "value1");
		linkedMap.put("property2", null);

		extensions.put("x-my-vendor-extensions", linkedMap);
		return extensions;
	}
Tests Spring meta-annotations as method parameters
springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app138/SpringDocApp138Test.java