### Question:
Formats { public static String join(List<String> list, String delim) { StringBuilder sb = new StringBuilder(); String loopDelim = ""; for (String s : list) { sb.append(loopDelim); sb.append(s); loopDelim = delim; } return sb.toString(); }  static void disableAnsi(); static void setCleanClearTerminal(); static void setTextClearTerminal(); static String toMBWithColor(long bytes, LongWarning warning); static String toColor(long value, LongWarning warning); static String red(String value); static String yellow(String value); static String toMB(long bytes); static String toSizeUnitWithColor(Long size, LongWarning warning); static String toSizeUnit(Long size); static String toFixLengthSizeUnit(Long size); static String toTimeUnit(long millis); static String formatUsage(Usage usage); static String formatUsageWithColor(Usage usage, LongWarning warning); static String[] colorAnsi(long value, LongWarning warning); static String[] colorAnsi(double value, DoubleWarning warning); static String rightStr(String str, int length); static String leftStr(String str, int length); static String shortName(String str, int length, int rightLength); static String join(List<String> list, String delim); static long parseFromSize(String str); static void clearTerminal(); static final long MB_SIZE; static boolean isWindows; }### Answer:
@Test public void joinInput0NotNullOutputNotNull() { final ArrayList<String> list = new ArrayList<String>(); final String delim = "AAAAAAAA"; final String retval = Formats.join(list, delim); Assert.assertEquals("", retval); }
@Test public void joinInput1NullOutputNotNull() { final ArrayList<String> list = new ArrayList<String>(); list.add(""); final String delim = null; final String retval = Formats.join(list, delim); Assert.assertEquals("", retval); }