@AfterEach
	public void unregisterConverter() {
		converters.removeConverter(stringyConverter);
	}
This test is to make sure that a new model converter can access the parent of a type, even if
the type is enclosed in an ignored wrapper.  We test this by setting up a model converter which
adds "stringy" to the "required" property of a schema's parent, when the sub schema is a String.
springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app157/SpringDocApp157Test.java