They can do a good job, but you need to be very careful. "Oh, it's faster if you start the container once and then run all the tests in it." Yeah but now your t

They can do a good job, but you need to be very careful. "Oh, it's faster if you start the container once and then run all the tests in it." Yeah but now your tests are all peeing in each other's pool. The upside of mocks is that the values returned are literally hard coded.