### Question:
UTSUtil { public String stripLeadingCharacters(String passId) { if (passId == null) return null; if (passId.length() == 0) return passId; while (passId.charAt(0) >= 'A' && passId.charAt(0) <= 'Z' ) { if (passId.length() == 1) return ""; passId = passId.substring(1, passId.length()); } return passId; }  List<OperatorAssignment> listConvertOpAssignTcipToJson(
    ModelCounterpartConverter<SCHOperatorAssignment, OperatorAssignment> conv,
    List<SCHOperatorAssignment> inputAssigns); String stripLeadingCharacters(String passId);  }### Answer:
@Test public void testStripChars() { UTSUtil u = new UTSUtil(); assertEquals(null, u.stripLeadingCharacters(null)); assertEquals("", u.stripLeadingCharacters("")); assertEquals("1", u.stripLeadingCharacters("1")); assertEquals("", u.stripLeadingCharacters("B")); assertEquals("1", u.stripLeadingCharacters("B1")); assertEquals("11", u.stripLeadingCharacters("B11")); }