@Override
    @ManagedOperation(description = "Clear the store")
    public void clear() {
        cache.invalidateAll();
    }
@Test
    void testClear() {
        // add key to remove
        assertTrue(repo.add(key01));
        assertTrue(repo.confirm(key01));

        // remove key
        assertTrue(repo.remove(key01));
        assertFalse(repo.confirm(key01));

        // try to remove a key that isn't there
        repo.remove(key02);
    }