It is easier to test some program designs than others. Sometimes, the best design is one that’s hard to test... Sometimes, but in my experience this is rare. M

It is easier to test some program designs than others. Sometimes, the best design is one that’s hard to test... Sometimes, but in my experience this is rare. Much more often, the easiest to code solution is both the hardest to test and to maintain, which is why having some TDD discipline more often results in better design, not worse.