My project (that I'm currently trying to get away from) is a large project that has been cobbled together over many years from many different teams both internal and external.
In the beginning everything was done to get something shippable and now that the project has shipped it is a monolithic monstrosity. Several devs have made an effort to infuse unit testing into the project but they always fizzled out because estimated dev time never included testing and so if a crunch happens now then the first thing that is dropped is the testing effort. I have learned a lot from my project however it's a lesson in how not to do things.
I will say that code reviews are heavily enforced. So we at least have that.
In the beginning everything was done to get something shippable and now that the project has shipped it is a monolithic monstrosity. Several devs have made an effort to infuse unit testing into the project but they always fizzled out because estimated dev time never included testing and so if a crunch happens now then the first thing that is dropped is the testing effort. I have learned a lot from my project however it's a lesson in how not to do things.
I will say that code reviews are heavily enforced. So we at least have that.