public function delete(UnitTester $I)
{
$I->wantTo('Delete from cache by using Memcache as cache backend');
$cache = new Memcache(new Data(['lifetime' => 20]), ['host' => TEST_MC_HOST, 'port' => TEST_MC_PORT]);
$I->assertFalse($cache->delete('non-existent-keys'));
$I->haveInMemcached('some-key-to-delete', 1);
$I->assertTrue($cache->delete('some-key-to-delete'));
$I->dontSeeInMemcached('some-key-to-delete');
$I->clearMemcache();
}