We have lots of unit tests and a fair amount of integration tests. There is a staging environment as well, and I personally do a bit of manual testing whenever

We have lots of unit tests and a fair amount of integration tests. There is a staging environment as well, and I personally do a bit of manual testing whenever I push just to be sure nothing is catastrophically broken. Commits to master don't get automatically deployed, and we deploy manually to staging then to production. I like the idea of automatically deploying to staging. It takes one more step out of the process. When I worked at #2 there were 0 tests, which I believe is why management was often so afraid to deploy. Of course things are going to break if there are no tests. It took me a year to convince them to add unit tests, but we got there eventually.