protected function _removeUser()
{
$this->assertNull(self::$group->removeUser(self::$groupids[1], 'joe'));
$groups = self::$group->listGroups('joe');
$this->assertEquals(1, count($groups));
$this->assertEquals('My Group', $groups[self::$groupids[0]]);
$this->assertNull(self::$group->removeUser(self::$groupids[1], 'jane'));
$groups = self::$group->listGroups('jane');
$this->assertEquals(0, count($groups));
}