I generally follow this process: 1. Get it working: write the code for the desired behavior, not worrying about making it beautiful, testable, whatever. 2. Ge

I generally follow this process: 1. Get it working: write the code for the desired behavior, not worrying about making it beautiful, testable, whatever. 2. Get it working well: manually testing and finding edge cases, refactoring to get it testable and writing tests to solidify behavior. 3. Get it working fast: optimizing it to be as fast as I need it to be (can sometimes skip this step). No tests should change here, but only new tests.