### Question:
StringUtilities { public static String cut(String s, int length) { if (s == null) { return null; } final String end = "..."; return s.length() <= length ? s : s.substring(0, Math.max(length - end.length(), 0)) + end; } private  StringUtilities(); static String addHTMLLineBreaks(String text, int length); static String addLineBreaks(String msg, int lineLength); static String capitalize(String string); static String concat(Object... objects); static String concat(String... strings); static StringBuilder concat(StringBuilder sb, String... objects); static boolean containsHTML(String text); static String convertToHTML(String text); static String convertToHTML(String text, boolean pre); static String convertToHTMLTable(String text); static int count(char ch, String s); static int count(CharSequence str, String regex); static int count(Matcher matcher); static String cut(String s, int length); static boolean endsWith(String str, char c); static boolean endsWith(String str, List<? extends String> list); static String expandProperties(String input, Properties properties); static String[] explodeLineOnUnquotedCommas(String line); static String format(Object o); static String formatTimingMessage(String msg, long nanoseconds); static String formatTimingMessage(TimingMessageProvider provider, long nanoseconds); static String generateStackString(String threadName); static String generateStackString(String threadName, StackTraceElement[] trace); static String generateStackString(Thread thread); static Map<String, String> getSubProperties(Properties input, String prefix); static Map<String, T> getSubProperties(Properties input, String prefix, Class<T> type); static String getUniqueName(String prefix, Collection<? extends String> disallowedNames); static String getUniqueName(String prefix, Collection<? extends String> disallowedNames, String suffix); static boolean isInteger(String s); static String join(String separator, Collection<? extends Object> objects); static String join(String separator, int... objects); static String join(String separator, Object... objects); static String join(String separator, String... objects); static StringBuilder join(StringBuilder sb, String separator, Collection<? extends Object> objects); static StringBuilder join(StringBuilder sb, String separator, int... objects); static StringBuilder join(StringBuilder sb, String separator, Object... objects); static StringBuilder join(StringBuilder sb, String separator, String... objects); static String nonNull(String str); static String pad(String str, int desiredLength); static String removeHTML(String text); static String repeat(String str, int times); static StringBuilder repeat(String str, int times, StringBuilder sb); static String removePrefix(String s, String prefix); static String removeSuffix(String s, String suffix); static String getLastSubstring(String string, String delimiter); static String replace(String string, int index, char replacement); static String replaceSpecialCharacters(String string); static String safeTrim(String str); static String slashJoin(String... strings); static String stackTraceToString(Exception e); static boolean startsWith(String str, char c); static String toHexString(byte[] arr, String byteSeparator); static String toString(Object value); static String toString(Object value, String defaultValue); static String trim(String input); static String trim(String input, char... trimmableChars); static String trimBoth(String input, char trimmableChar); static String unEscapeString(String str); static final Charset DEFAULT_CHARSET; static final char DEGREE_SYMBOL; static final String EMPTY; static final String FILE_SEP; static final String LINE_SEP; }### Answer:
@Test public void testCut() { Assert.assertEquals(null, StringUtilities.cut(null, 5)); Assert.assertEquals("", StringUtilities.cut("", 5)); Assert.assertEquals("as", StringUtilities.cut("as", 2)); Assert.assertEquals("as", StringUtilities.cut("as", 6)); Assert.assertEquals("...", StringUtilities.cut("asdfgh", 2)); Assert.assertEquals("as...", StringUtilities.cut("asdfgh", 5)); }