### Question:
StringUtils { public static boolean isNotBlank(String s) { return !isBlank(s); } private  StringUtils(); static boolean isEmpty(final CharSequence cs); static boolean isNotEmpty(final CharSequence cs); static boolean isBlank(String s); static boolean isNotBlank(String s); static String replaceNRTtoUnderline(String src); static final String EMPTY; }### Answer:
@Test public void testIsNotBlank() { boolean b = StringUtils.isNotBlank(null); Assert.assertFalse(b); b = StringUtils.isNotBlank(""); Assert.assertFalse(b); b = StringUtils.isNotBlank(" "); Assert.assertFalse(b); b = StringUtils.isNotBlank(" test "); Assert.assertTrue(b); b = StringUtils.isNotBlank("test"); Assert.assertTrue(b); }