Parallel testing is an automated testing process that developers and testers can launch multiple tests against different real device combinations and browser configurations simultaneously. The goal of parallel testing is to resolve the constraints of time by distributing tests across available resources.
For example, if 20 test cases take a total of 100 minutes to complete, then 10 parallel execution could run 2 test cases each and bring the total testing time down to 10 minutes. Ideally, if you have sufficient resources, say 20 real mobile devices and real browsers for simultaneous execution of 20 test cases, then you’ll be able to significantly shrink the runtime to 5 minutes.
Benefits of Parallel Testing:
Speed: Sequential testing is time-consuming, while parallel testing will allow you to divide invested time by the number of environments. In order to test your application against ten devices, all you need to do is write only ONE script and run it against all your target devices, cutting your testing time by ten times.
Cost-Efficiency: The building, maintaining and keeping your own test environment up-to-date can burn a hole in your pocket. When it comes to parallel testing, maintenance isn’t a headache anymore — in fact, you lease the needed testing environment, always updated. Plus, cloud-based testing grids allow you to run tests at high concurrency, making the cost per test significantly lower.
Better Coverage: It’s always a good idea to run your application through as many platform-device-browser combinations as possible so that no bug sneaks in. Parallel testing will take your test coverage to the next level, giving you a significant ROI boost.
Optimization of Your CI/CD Processes: Parallel testing is the best friend of continuous integration and delivery. By testing in parallel, you can run tests as soon as developers submit new code updates throughout the entire SDLC. Timely reporting and quick feedback in parallel testing will also facilitate better communication between various departments.
Improvement of Testing Practices: Parallel testing improves the QA routine in your company. The reason is crystal clear: by testing at high speed, you can test more. This gives your QA team a chance to improve their testing practices and pinpoint bugs faster.