public function testDestroy()
 {
     $this->handler->write('456', 'data');
     $this->handler->destroy('123');
     $this->assertEquals('data', $this->handler->read('456'));
     $this->handler->destroy('456');
     $this->assertEmpty($this->handler->read('456'));
 }
 /**
  * Deletes a session from persistent storage.
  * Deliberately leaves session data in memory intact.
  */
 private function destroy()
 {
     $this->handler->destroy($this->id);
 }