I think unit tests are documentation in the same way that a Dockerfile is... it's not. The tests don't paint the bigger picture, explain why, etc.
That said, if you pitched me something like a Jupyter notebook style doc where tests validating the claims of the documentation were inline, I'd totally buy into that.
That said, if you pitched me something like a Jupyter notebook style doc where tests validating the claims of the documentation were inline, I'd totally buy into that.