/**
  * @covers $this->object->get_group
  * @todo   Implement testGet_group().
  */
 public function testGet_group()
 {
     $group = $this->object->get_group('test');
     $this->assertArrayHasKey('trees', $group);
     $this->assertArrayHasKey('oak', $group['trees']);
     $this->assertArrayHasKey('fairy', $group['trees']['oak']);
     $this->assertEquals($group['trees']['oak']['fairy'], 'Tinkerbell');
 }