public function test_it_can_remove_a_group_in_a_group()
 {
     $group1 = new PermissionGroup();
     $this->group->addGroup($group1);
     $groups = $this->group->getAllGroups();
     $this->assertEquals($groups[$group1->getId()], $group1);
     $this->group->removeGroup($group1);
     $groups = $this->group->getAllGroups();
     $this->assertFalse(isset($groups[$group1->getId()]));
 }