### Question:
StringUtils { public static boolean isNotEmpty(final String text) { return !isEmpty(text); }  static boolean isEmpty(final String text); static boolean isNotEmpty(final String text); static boolean isBlank(final String text); static boolean isNotBlank(final String text); static int length(final String text); static String[] split(final String str, final String separatorChars); static String lowerWord(CharSequence cs, char c); static int asciiSizeInBytes(long v); static String join(String... strings); static String build(String delimiter, String prefix, String suffix, String... strings); static byte[] utf8Bytes(CharSequence str); static byte[] bytes(CharSequence str); static byte[] bytes(CharSequence str, Charset charset); static String format(String str, Object... arguments); static String readString(InputStream inputStream); static String readString(InputStream inputStream, Charset charset); static String readString(Reader reader); static final String EMPTY; static final String SPACE; static final String LF; static final String CR; static final String COMMA; static final String[] EMPTY_STRING_ARRAY; }### Answer:
@Test public void testIsNotEmpty() { assertTrue(!StringUtils.isNotEmpty("")); assertTrue(!StringUtils.isNotEmpty(null)); assertTrue(StringUtils.isNotEmpty(" ")); assertTrue(StringUtils.isNotEmpty("test")); assertTrue(StringUtils.isNotEmpty(" test ")); }