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Even the digital property liberators/internet pirates don’t test their software. I feel like I’m on an island with a small population of test enthusiasts.
Ultimately, what's the point. The tool either works, or it doesn't. Then you patch what doesn't work so it does work.
Heck even the Linux kernel isn't tested.
Unit tests are so management can have a good metric to sell code quality. I don't know any time unit testing has actually benefited shipping faster (which really is the only bottom line those above you care about)
Apart from the Linux Test Project [0], run by all the big Linux names, who regularly issue very detailed bug reports and usually patches as well, you mean?