PathHelper { public static boolean isValid(final String path) { return PATH_PATTERN.matcher(path).matches(); } private  PathHelper(); static boolean isValid(final String path); static boolean isRelative(final String path); static String getParent(final String path); static String getFileName(final String path); static String getExtension(final String path); static String removeExtension(final String path); static String replaceExtension(final String path, String extension); static String toAbsolute(String dirName, String path); static String fullyQualifiedNameToDirName(
      final String fullyQualifiedName); static String packageNameToDirName(final String packageName); static String fullyQualifiedNameToAbsolute(
      final String fullyQualifiedName, final String path); static String packageNameToAbsolute(final String packageName,
      final String path); static String fullyQualifiedNameToPath(
      final String fullyQualifiedName, final String extension); static String fullyQualifiedNameToPath(
      final String fullyQualifiedName, final String suffix,
      final String extension); static final String PATH_REGEXP; }
@Test(groups = {"functional"}) public void testIsValid() { assertTrue(isValid("bar.txt")); assertTrue(isValid("foo/bar.txt")); assertTrue(isValid("./foo/bar.txt")); assertTrue(isValid("./../foo/bar.txt")); assertTrue(isValid("/foo/bar.txt")); assertFalse(isValid("foo assertFalse(isValid("/../foo/bar.txt")); }