### Question:
PropertyUtils { public static String getString(String key) { return properties.getProperty(key.trim()); } private  PropertyUtils(); static Boolean getResUploadStartupState(); static String getString(String key); static String getUpperCaseString(String key); static String getString(String key, String defaultVal); static int getInt(String key); static int getInt(String key, int defaultValue); static boolean getBoolean(String key); static Boolean getBoolean(String key, boolean defaultValue); static long getLong(String key, long defaultVal); static long getLong(String key); double getDouble(String key, double defaultVal); static String[] getArray(String key, String splitStr); T getEnum(String key, Class<T> type,
                                         T defaultValue); static Map<String, String> getPrefixedProperties(String prefix); static void setValue(String key, String value);  }### Answer:
@Test public void getString() { assertNotNull(PropertyUtils.getString(Constants.FS_DEFAULTFS)); }