private static File saveCert(KeyAndCert keyCert) throws Exception {
		return saveKeyStore(keyCert.subject(), keyCert::storeCert);
	}
Already proved this in waitForRegistration(). Keep this Test to express test
purpose explicitly.
spring-cloud-netflix-eureka-client-tls-tests/src/test/java/org/springframework/cloud/netflix/eureka/BaseCertTests.java