@Test
 public void formatBytes() {
   final PFUserDO user = new PFUserDO();
   user.setLocale(Locale.UK);
   PFUserContext.setUser(user);
   assertEquals("0 bytes", NumberHelper.formatBytes(0));
   assertEquals("1023 bytes", NumberHelper.formatBytes(1023));
   assertEquals("1 kb", NumberHelper.formatBytes(1024));
   assertEquals("1 kb", NumberHelper.formatBytes(1075));
   assertEquals("1.1 kb", NumberHelper.formatBytes(1076));
   assertEquals("99.9 kb", NumberHelper.formatBytes(102297));
   assertEquals("1,023 kb", NumberHelper.formatBytes(1047552));
   assertEquals("1 Mb", NumberHelper.formatBytes(1048576));
   assertEquals("1 Gb", NumberHelper.formatBytes(1073741824));
 }