How does automation testing increase reliability?

Automation testing increases reliability primarily through consistent execution of tests without human error. In manual testing, the risk of human mistakes—such as missed steps, incorrect data entry, or variations in testing environments—can introduce variability and potential inaccuracies in test results. However, automation allows for tests to be run in the same way each time, significantly reducing inconsistencies and enhancing the overall reliability of the testing process.

Automated tests can be programmed to follow precise steps, thus ensuring that all aspects of the application are tested under the same conditions. This repeatability means that any defects or issues identified are more likely to be due to actual problems in the code rather than mistakes made during the testing process. Consequently, automation not only improves the reliability of test outcomes but also builds greater confidence in the software’s quality before it reaches production.

While other options may touch on various aspects of testing, they do not align with the essence of reliability. Random testing practices, creating random test scripts, and using less documentation can introduce uncertainty and reduce the thoroughness of testing, which ultimately detracts from the reliability that automation aims to achieve.