private static String agentNameToCompareAgainst() {
        VersionNumber currentVersion = Jenkins.getStoredVersion();
        if (currentVersion == null) {
            throw new IllegalArgumentException("Couldn't get jenkins version");
        }
        return "permanent";
    }
@author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
test-harness/src/test/java/io/jenkins/plugins/casc/BackwardCompatibilityTest.java