setSessionData example

$this->attributes = new AttributeBag();
        $this->flashes = new FlashBag();

        $this->data = [
            $this->attributes->getStorageKey() => ['foo' => 'bar'],
            $this->flashes->getStorageKey() => ['notice' => 'hello'],
        ];

        $this->storage = new MockArraySessionStorage();
        $this->storage->registerBag($this->flashes);
        $this->storage->registerBag($this->attributes);
        $this->storage->setSessionData($this->data);
    }

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