The objective of automated testing is to simplify as much of the testing effort as possible with a minimum set of scripts. If unit testing consumes a large percentage of a quality assurance (QA) team's resources, for example, then this process might be a good candidate for automation. Automated testing tools are capable of executing tests, reporting outcomes and comparing results with earlier test runs. Tests carried out with these tools can be run repeatedly, at any time of day.
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Considering all of its shortcomings, we are lucky that testing existing functionality isn’t really testing. As we said before, real testing is questioning each and every aspect and underlying assumption of the product. Existing functionality has already endured that sort of testing. Although it might be necessary to re-evaluate assumptions that were considered valid at the time of testing, this is typically not necessary before every release and certainly not continuously. Testing existing functionality is not really testing. It is called regression testing, and although it sounds the same, regression testing is to testing like pet is to carpet—not at all related. The goal of regression testing is merely to recheck that existing functionality still works as it did at the time of the actual testing. So regression testing is about controlling the changes of the behaviour of the software. In that regard it has more to do with version control than with testing. In fact, one could say that regression testing is the missing link between controlling changes of the static properties of the software (configuration and code) and controlling changes of the dynamic properties of the software (the look and behaviour). Automated tests simply pin those dynamic properties down and transform them to a static artefact (e.g. a test script), which again can be governed by current version control systems.
Business applications are built based on the requirements from the business users. Also, these business applications are built to use certain kind of Business transactions or data items. These business applications run flawlessly until there are no new business requirements or there is no change in underlying Business transactions. Also, the business applications run flawlessly if there are no issues with computer hardware, computer networks (Intenet/intranet), computer disks, power supplies, and various software components (middleware, database, computer programs, etc.).
As mentioned previously, automated testing frees you up to focus on larger issues such as customer needs, functionality and improvements. Automated testing also reduces the cost and need for multiple code revisions, so over the course of time, the investment pays out. In addition, each time the source code is modified, the software tests can be repeated. Manually repeating these tests is costly and time-consuming, but automated tests can be run over and over again at no additional cost.
I think we can all agree that automation is a critical part of any organization's software delivery pipeline, especially if you call yourself "agile." It's pretty intuitive that if you automate testing, your release cycles are going to get shorter. "So, if that's the case," you might say, "why don't we just automate everything?" There's a good reason: automation comes with a price.