public function testStart() {
$this
->assertEquals('', $this->storage
->getId());
$this
->assertTrue($this->storage
->start());
$id = $this->storage
->getId();
$this
->assertNotEquals('', $this->storage
->getId());
$this
->assertTrue($this->storage
->start());
$this
->assertEquals($id, $this->storage
->getId());
}