unit and e2e tests

[ifatihyildirim]

I added some unit and e2e tests. I preferred jest, testing-library and cypress packages for tests. The tests I added are not very extensive, but I thought it was enough to get started. happy coding :)

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more). To see the status of your deployment, click below or on the icon next to each commit.

[ademilter]

@ifatihyildirim bunu nasıl kaçırdım bilmiyorum, yeni gördüm. kontrolleri yapıcam. süpersin