### Question:
ConfigUtils { public static String prettyPrint(Config config) { return redact(config.root().withOnlyKey("oryx").render(RENDER_OPTS)); } private  ConfigUtils(); static Config getDefault(); static Config overlayOn(Map<String,?> overlay, Config underlying); static String getOptionalString(Config config, String key); static List<String> getOptionalStringList(Config config, String key); static Double getOptionalDouble(Config config, String key); static void set(Map<String,Object> overlay, String key, Path path); static String serialize(Config config); static Config deserialize(String serialized); static String prettyPrint(Config config); static Properties keyValueToProperties(Object... keyValues);  }### Answer:
@Test public void testPrettyPrint() { String pretty = ConfigUtils.prettyPrint(ConfigUtils.getDefault()); assertContains(pretty, "oryx {"); assertContains(pretty, "batch {"); assertContains(pretty, "master=yarn"); assertContains(pretty, "password=*****"); assertContains(pretty, "keystore-password=*****"); }