### Question:
LoggerFactory { static boolean isBlank(CharSequence cs) { int strLen; if (cs == null || (strLen = cs.length()) == 0) { return true; } for (int i = 0; i < strLen; i++) { if (!Character.isWhitespace(cs.charAt(i))) { return false; } } return true; }  static Logger getLogger(Class<?> clazz); static Logger getLogger(String name);  }### Answer:
@Test public void testIsBlank() { Assert.assertFalse(LoggerFactory.isBlank("123")); Assert.assertTrue(LoggerFactory.isBlank(" ")); Assert.assertTrue(LoggerFactory.isBlank("")); Assert.assertTrue(LoggerFactory.isBlank(null)); Assert.assertTrue(LoggerFactory.isBlank(" ")); Assert.assertTrue(LoggerFactory.isBlank("\r\t")); }