Unit tests – FIRST tests
In this section, we’re going to look at the base of the test pyramid, which consists of unit tests. We’ll examine why this layer is critical to success.
By now, we’re very familiar with FIRST unit tests. The preceding chapters have covered these in detail. They are the gold standard of unit tests. They are fast to run. They are repeatable and reliable. They run isolated from each other, so we can run one, or run many and run them in any order we choose. FIRST tests are the powerhouses of TDD, enabling us to work with a rapid feedback loop as we code. Ideally, all our code would fall under this feedback loop. It provides a fast, efficient way to work. At every step, we can execute code and prove to ourselves that it is working as we intended. As a helpful byproduct, by writing tests that exercise each possible desirable behavior in our code, we will end up exercising every possible code path. We will get 100% meaningful test coverage...
