public function testClear()
{
$result = $this->_redis->set('key', 'value');
$this->assertTrue($result);
$result = $this->_redis->set('another_key', 'value');
$this->assertTrue($result);
$result = $this->redis->clear();
$this->assertTrue($result);
$this->assertFalse($this->_redis->get('key'));
$this->assertFalse($this->_redis->get('another_key'));
}