### Question:
CategoryPath implements Comparable<CategoryPath> { public boolean isAncestorOrSelf(CategoryPath candidateAncestorPath) { if (candidateAncestorPath.isRoot()) { return true; } CategoryPath path = this; while (!path.isRoot()) { if (candidateAncestorPath.equals(path)) { return true; } path = path.getParent(); } return false; } private  CategoryPath();  CategoryPath(CategoryPath parent, String... subPathElements);  CategoryPath(CategoryPath parent, List<String> subPathElements);  CategoryPath(String path); static String escapeString(String nonEscapedString); static String unescapeString(String escapedString); boolean isRoot(); CategoryPath getParent(); String getName(); String getPath(); @Override boolean equals(Object obj); @Override int hashCode(); boolean isAncestorOrSelf(CategoryPath candidateAncestorPath); String[] getPathElements(); @Override int compareTo(CategoryPath other); @Override String toString(); List<String> asList(); String[] asArray(); static final char DELIMITER_CHAR; static final String DELIMITER_STRING; static final String ESCAPED_DELIMITER_STRING; static final CategoryPath ROOT; }### Answer:
@Test public void testIsAncestorRootRoot() { assertTrue(CategoryPath.ROOT.isAncestorOrSelf(CategoryPath.ROOT)); }
@Test public void testIsAncestorRootApple() { CategoryPath apple = new CategoryPath("/apple"); assertTrue(apple.isAncestorOrSelf(CategoryPath.ROOT)); assertFalse(CategoryPath.ROOT.isAncestorOrSelf(apple)); }
@Test public void testIsAncestorAppleSubApple() { CategoryPath apple = new CategoryPath("/apple"); CategoryPath applesub = new CategoryPath("/apple/sub"); assertTrue(applesub.isAncestorOrSelf(apple)); assertTrue(applesub.isAncestorOrSelf(applesub)); }
@Test public void testIsAncestorAppleSubNotApple() { CategoryPath applesub = new CategoryPath("/apple/sub"); CategoryPath notapple = new CategoryPath("/notapple"); assertFalse(applesub.isAncestorOrSelf(notapple)); }
@Test public void testIsAncestorAppleSubApp() { CategoryPath applesub = new CategoryPath("/apple/sub"); CategoryPath app = new CategoryPath("/app"); assertFalse(applesub.isAncestorOrSelf(app)); }