Method testRetainAll

src/test/java/org/mapdb/BTreeSet3Test.java:297–311

()

     * retainAll(c) retains only those elements of c and reports true if changed
     */
    public void testRetainAll() {
        NavigableSet q = populatedSet(SIZE);
        NavigableSet p = populatedSet(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            boolean changed = q.retainAll(p);
            if (i == 0)
                assertFalse(changed);
            else
                assertTrue(changed);

            assertTrue(q.containsAll(p));
            assertEquals(SIZE-i, q.size());
            p.pollFirst();
        }
    }

    /*
     * removeAll(c) removes only those elements of c and reports true if changed