public Collection<JID> getAdmins() {
        return administrators;
    }
@Test
    public void testOverrideBareJidWithFullJid() throws Exception
    {
        // Setup test fixture.
        final String groupName = "unit-test-group-l";
        final Group group = groupManager.createGroup(groupName);
        final JID fullJid = new JID("unit-test-user-l", "example.org", "unit-test-resource-l");
        final JID bareJid = fullJid.asBareJID();
        group.getAdmins().add(bareJid);

        // Execute system under test.
        final boolean result = group.getAdmins().add(fullJid);

        // Verify results.
        assertFalse(result);
    }