Running UI tests in parallel mode

At Picscout, we use automated testing.
Running tests is an integral part of our Continuous Integration and Continuous Deployment workflow.
It allows us to implement new features quickly, since we are always confident that the product still works as we expect.
The automation tool that we are using is Selenium (Selenium is an open source set of tools for the automatic running of browser-based applications).
Despite the many benefits of Selenium, there is one drawback that constitutes a bottleneck: the running time of the tests.
For example, in one of our projects, we need to run 120 UI tests, which takes 75 minutes – a long time to wait for a deployment.
To handle this situation, we developed a tool that runs the tests in parallel mode.
Using this tool, we were able to reduce the run time to 12 minutes of tests.

How it works:
Two tests can be run in parallel mode as long as they are not affected by each other.
We avoid writing tests that use and modify the same data, since they cannot be run in parallel.
The assumption is that two tests can be run in parallel mode if each test has a different id