public static String setProperty(String key, String value) {
        System.setProperty(key, System.getProperty(key, value));
        return System.getProperty(key);
    }
Sets the system property indicated by the specified key unless already defined

@param key  the name of the system property.
@param value the value of the system property.
@return the new value of the system property,
test/common/src/main/java/io/apiman/test/common/util/TestUtil.java