public TestUnmodifiableSortedSet(String testName) 
{
        super(testName);
}

 public String getCompatibilityVersion() 
{
        return "3.1";
}

 public boolean isAddSupported() 
{
        return false;
}

 public boolean isRemoveSupported() 
{
        return false;
}

 public static  void main(String[] args) 
{
        String[] testCaseName = { TestUnmodifiableSortedSet.class.getName()};
        junit.textui.TestRunner.main(testCaseName);
}

 public Set makeEmptySet() 
{
        return UnmodifiableSortedSet.decorate(new TreeSet());
}

 public Set makeFullSet() 
{
        TreeSet set = new TreeSet();
        set.addAll(Arrays.asList(getFullElements()));
        return UnmodifiableSortedSet.decorate(set);
}

 protected  void setupSet() 
{
    
        set = (UnmodifiableSortedSet) makeFullSet();
        array = new ArrayList();
        array.add(new Integer(1));
}

 public static Test suite() 
{
        return BulkTest.makeSuite(TestUnmodifiableSortedSet.class);
}

 public  void testComparator() 
{
        setupSet();
        Comparator c = set.comparator();
        assertTrue("natural order, so comparator should be null", c == null);
}

 public  void testUnmodifiable() 
{
        setupSet();
        verifyUnmodifiable(set);
        verifyUnmodifiable(set.headSet(new Integer(1)));
        verifyUnmodifiable(set.tailSet(new Integer(1)));
        verifyUnmodifiable(set.subSet(new Integer(1), new Integer(3)));
}

Verify that base set and subsets are not modifiable

 public  void verifyUnmodifiable(Set set) 
{
        try {
            set.add("value");
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected  
        }
        try {
            set.addAll(new TreeSet());
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected
        }
        try {
            set.clear();
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected
        }
        try {
            set.remove("x");
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected
        }
        try {
            set.removeAll(array);
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected
        }
        try {
            set.retainAll(array);
            fail("Expecting UnsupportedOperationException.");
        } catch (UnsupportedOperationException e) {
            // expected
        }
}

Verifies that a set is not modifiable