public function testICanObtainTokens()
 {
     $code = '<?php echo ok;';
     $mutation = new \Hal\MutaTesting\Mutation\Mutation();
     $mutation->setTokens(new \Hal\Component\Token\TokenCollection(token_get_all($code)));
     $tokens = $mutation->getTokens();
     $this->assertEquals(5, sizeof($tokens->asArray()));
 }