Tools { public static String appendSlash(final String path) { final String fileSeparator = System.getProperty("file.separator"); if (path.endsWith(fileSeparator)) { return path; } else { return path + fileSeparator; } } private  Tools(); static String getTime(); static String getDoubleDigit(final int number); static String dateToString(@Nullable final Date d, final String format); static String decimalFormat(final String format, final double number); static boolean isValidNick(@Nullable final String nick); static String byteToString(final long bytes); static int getBytes(final String text); static void sleep(final long millis); @Nullable static String capitalizeFirstLetter(@Nullable final String word); @Nullable static String shorten(@Nullable final String word, final int length); @Nullable static String getFileExtension(@Nullable final String filename); @Nullable static String getFileBaseName(@Nullable final String filename); static double percent(final double fraction, final double total); static double percentOf(final double percent, final double total); static String postPadString(final String stringToPad, final int paddedLength); static boolean isEmpty(@Nullable final String string); static String appendSlash(final String path); static File getFileWithIncrementedName(final File existingFile); static String emptyIfNull(@Nullable final String string);  }
@Test public void appendSlashShouldWorkWithLinuxPaths() { System.setProperty("file.separator", "/"); assertEquals("/var/log/", Tools.appendSlash("/var/log")); assertEquals("/var/log/", Tools.appendSlash("/var/log/")); }
@Test public void appendSlashShouldWorkWithWindowsPaths() { System.setProperty("file.separator", "\\"); assertEquals("C:\\some folder\\logs\\", Tools.appendSlash("C:\\some folder\\logs")); assertEquals("C:\\some folder\\logs\\", Tools.appendSlash("C:\\some folder\\logs\\")); }