/**
  * @covers ::__construct
  * @covers ::setOptions
  * @covers ::read
  * @covers ::write
  * @covers ::clear
  */
 public function testClear()
 {
     $session = new Session();
     $session->write('key1', 'value1');
     $session->write('key2', 'value2');
     $session->write('key3', 'value3');
     $session->clear('key1');
     $this->assertArrayNotHasKey('key1', $_SESSION);
     $this->assertArrayHasKey('key2', $_SESSION);
     $session->clear();
     $this->assertEmpty($_SESSION);
 }