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What are the reasons to run Selenium tests in parallel?

Can anyone please suggest me some what are the reasons to run Selenium tests in parallel.

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Posted 3 months ago

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There are various reasons that make it crucial for testers to adopt parallel testing as their first testing approach. Some of the most popular reasons are:

Wide Test Coverage

Executing tests in parallel is a faster approach than sequential testing, as it provides testers with wider test compatibility in less span. For example, if you want to test the user interface functionality of a new web application, then you don’t have to run tests again and again for different OS and browser combinations, you can test all the combinations at the same time by running tests in parallel.

Reduce Testing Time

Sequential testing does provide comprehensive and thorough testing of an application, but it is very time-consuming. On the other hand, parallel testing can reduce the overall testing time by running tests on multiple machines in parallel. For example, if you want to run 100 concurrent tests, then you can reduce the testing time by a factor of 100, which in turn helps you deliver the product more quickly.


Sequential testing requires developing, maintaining, and keeping the test environment up-to-date, which can affect your overall budget. But parallel testing is an automated process that runs on the cloud, so there is no need for maintenance. Moreover, you don’t have to worry about the updates, as the cloud infrastructure is always updated.

Optimize Continuous Integration And Delivery

For continuous integration and continuous delivery, you need to run functional tests frequently and quickly. And if you run tests in parallel, it will not only buy you more time but also allows you to have detailed reports of test data. Development teams can later use these reports to find issues in the code and fix them quickly in order to optimize CI/CD.

Continuous Testing

A great way to release high-quality products in the shortest time possible is using continuous integration and delivery methodology. Continuous testing requires a faster test cycle, which is not feasible with sequential testing. However, if you use parallel testing that allows you to leverage the cloud and virtualization to perform more tests at a faster speed, then you can release products more quickly to the market.

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Posted 3 months ago

The parallel test execution is different from sequential testing, where we test different modules or functionalities one after the other. Even in the case of testing applications on multiple browsers, tests are performed sequentially on various browsers. This approach of testing is very time-consuming.

Parallel testing helps to reduce execution time and efforts and results in faster time to delivery. It proves to be handy specifically in case of automation, compatibility testing, localization, and internalization testing. In a scenario where we have two versions of software available, and we need to check its stability and compatibility, we can run the two versions simultaneously and find issues at a much faster rate.

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Posted one month ago