There are various tools that help software teams build and execute automated tests. Many teams are actively using unit tests as part of their development efforts to verify critical parts of their projects such as libraries, models and methods. Historically, testing user interfaces of desktop-based applications via automated tests have been more challenging, and currently available tools for this are usually commercial and quite expensive.
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While automation saves you a lot of time, it still takes time. You can't run all your tests all the time. It takes too long and would generate an unmanageable analysis and maintenance effort. In my group, we've taken both manual and automation testing to three levels: sanity, end-to-end, and full. In addition to our feature tests, on every code commit, we run a set of high level, cross-feature tests to make sure that a code change in one feature hasn't broken another one. Only then do we run a set of more extended tests specific to the feature for which the code was committed. Then, we run our suite of feature-level sanity tests on our continuous delivery environment every three hours to make sure all features are in good shape. We only do this on one browser though, because we've found that if a test fails, it doesn't usually depend on the browser. Finally, we run feature end-to-end testing on our nightly environment.
Selenium is possibly the most popular open-source test automation framework for Web applications. Being originated in the 2000s and evolved over a decade, Selenium has been an automation framework of choice for Web automation testers, especially for those who possess advanced programming and scripting skills. Selenium has become a core framework for other open-source test automation tools such as Katalon Studio, Watir, Protractor, and Robot Framework.