Automated visual regression testing tools check for style issues and problems with the visual layer of an app or website. The benefit of these tools is that they can catch issues on the visual layer (the user interface of the website or app, which customers see) that may get missed by test scripts that only interact with the underlying code (the DOM).

Flaky tests are automated software tests that sometimes pass and sometimes fail without an obvious reason. Often these tests will work well for a while, then occasionally start to fail. If the test passes on a second or third try without any obvious reason for the failures, the tester typically chalks it up to a glitch in the system and ignores the failed test result.