Pretty common honestly. There's a lot of shops that never got on board with TDD, and probably an equal number that tried, but aren't doing it correctly.
I won't deny they help when done well, but more often than not I've seen unit tests bolted onto the end of a project with poor/no requirements, functioning as little more than code-wise documentation of the state of the system at the time the test was written, rather than its adherence to business logic mandates.
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