A simple but very effective pattern for writing clear tests, presented with examples by Andrew Knight.
In short, yes, but it has to be done well. Mehul Kagathara explains why and how to test in production while taking into consideration the potential risks.
This is a MASSIVE article by Alexey Golub challenging the status quo of the best practices in unit testing. By using code examples, Alexey explains what works well and what could work in a better way. Also, it's worth checking the comments section because the discussion there is as meaty as the article itself!