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Web UI Testing Made Easy with Zalenium

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I so far was always afraid to mess with UI tests and SeleniumHQ. Thanks to Zalenium, a dockerized "it just works" Selenium Grid from Zalando, I finally managed to start writing UI tests.

Zalenium takes away all the pain of setting up Selenium with suitable browsers and keeps all of that nicely contained within Docker containers (docker-selenium). Zalenium also handles spawning more browser containers on demand and even integrates with cloud-based selenium providers (Sauce Labs, BrowserStack, TestingBot).

To demonstrate how easy it is to get started I setup a little demo project (written in Python with Flask) that you can use for inspiration. The target application is developed and tested on the local machine (or a build agent) while the test browsers run in Docker and are completely independent from my desktop browser:
A major challenge for this setup is accessing the application that runs on the host from within the Docker containers. Dockers network isolation normally prev…