public function delete(UnitTester $I)
{
$I->wantTo('Delete from cache by using Redis as cache backend');
$cache = new Redis(new Data(['lifetime' => 20]), ['host' => TEST_RS_HOST, 'port' => TEST_RS_PORT]);
$I->assertFalse($cache->delete('non-existent-keys'));
$I->haveInRedis('string', '_PHCR' . 'some-key-to-delete', 1);
$I->assertTrue($cache->delete('some-key-to-delete'));
$I->dontSeeInRedis('_PHCR' . 'some-key-to-delete');
}