This only works on small code bases. With anything large you're going to need to mock or fake your own code if you don't want to spend countless unnecessary hours running your tests and finding root causes of failed tests.
Yes, integration tests are important too, but you'll want to minimize the number of scenarios you still need to test at that level.
Yes, integration tests are important too, but you'll want to minimize the number of scenarios you still need to test at that level.