@Override
        public Reader createReader() {
            try {
                if (content != null) return new StringReader(content);
                if ( ! exists()) throw new FileNotFoundException("File '" + file + "' does not exist");
                return IOUtils.createReader(file, "UTF-8");
            }
            catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }
The content of this file, or null to read it from the file system.
config-model/src/main/java/com/yahoo/config/model/test/MockApplicationPackage.java