code: public static String notContain(String textToSearch, String substring) throws IllegalArgumentException {
  		return notContain(textToSearch, substring, "[Assertion failed] - this String argument must not contain the substring [{}]", substring);
  	}
docs: 断言给定字符串是否不被另一个字符串包含（既是否为子串）
  
  <pre class="code">
  Assert.doesNotContain(name, "rod", "Name must not contain 'rod'");
  </pre>
  
  @param textToSearch 被搜索的字符串
  @param substring 被检查的子串
  @return 被检查的子串
  @throws IllegalArgumentException 非子串抛出异常