Failure to test is one of the biggest contributors to the ongoing backsliding in IT. We have programs roll out to today that clearly show that no one wanted to spend the time nor money on simple tests.
I regularly witness failures for routine things that were resolved two decades ago that anyone with basic skills could prevent.
Not in OUR corporation. We undergo rigorous SIT and UAT, and test cases are generated from Acceptance criteria in the Stories.
Also, we have a Security Scan that spans all third party libraries and any open source material.
In fact, for a deploy to even be allowed, there must be at least one test-case for every acceptance criteria bullet point, as well as a passed third-party security scan (among many other things)
Yeah, if you are serious you must have QA and testing processes in place. Always amazing when stuff goes live without even basic testing.