### Question:
Formats { public static String toMB(long bytes) { if (bytes < 0) { return "NaN"; } long mb = bytes / MB_SIZE; if (mb < 9999) { return mb + "m"; } else { return toSizeUnit(bytes).trim(); } }  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 toMBInputNegativeOutputNotNull() { final long bytes = -8L; final String retval = Formats.toMB(bytes); Assert.assertEquals("NaN", retval); }
@Test public void toMBInputPositiveOutputNotNull() { final long bytes = 8L; final String retval = Formats.toMB(bytes); Assert.assertEquals("0m", retval); }