/**
* Tests the getting and setting of the key.
*
* @covers \phpDocumentor\GraphViz\Attribute::getKey
* @covers \phpDocumentor\GraphViz\Attribute::setKey
*
* @return void
*/
public function testKey()
{
$this->assertSame($this->fixture->getKey(), 'a', 'Expecting the key to match the initial state');
$this->assertSame($this->fixture, $this->fixture->setKey('b'), 'Expecting a fluent interface');
$this->assertSame($this->fixture->getKey(), 'b', 'Expecting the key to contain the new value');
}
