A reintroduction to TDD

So I’ve been writing a forest.

And I’ve been writing tests for it.

It’s been a lot of fun, and I’ve gotten a second wind on the project in the past couple weeks. I’ve written a bunch of code!

However, a lot of features have yet to be implemented. The code I’ve been writing has largely been RSpec, which you can see in this PR. As of right now, most of those tests fail, which isn’t a mistake.

I’ve been TDDing the forest a lot. Not everything, but a lot of things. Professionally, I’ve always regarded TDD like veganism: yes, you can make a lot of great arguments in its favor that I cannot honestly counter, but I just can’t imagine myself actually following through with it. So while I’ve historically written tests, they usually don’t come first.

Good arguments against TDD exist, and I certainly don’t think it’s the be-all and end-all. Some people are really off-puttingly dogmatic about it. But I’ve discovered, personally and for the first time, reasons to do it.

  1. It’s meditative. I’m not going to substantiate this because it’s very subjective, but there. It feels good.
  2. Non-passing tests act as a very difficult-to-ignore to-do list. I have a bunch of to-do lists devoted to the forest, including Trello, post-it notes, and #TODO and #FIXME comments scattered throughout my code (which is great for indelibly affixing a task to a particular line), but nothing encourages me to act more than a yellow or red dot in a sea of green.
  3. I’m not on a timeline. TDD does take longer up front, at least in my experience. Maybe one day I’ll get good enough at it that that won’t take any longer than writing the other way around. Of course, professional projects usually are on a timeline, so this reason might not convince your boss.
  4. It makes my coding intentional. Every time I write a method, it is to get a particular behavior. If I start building a workaround that goes off into some space not covered by the spec, I feel it immediately.
  5. It makes my code prettier. This is also subjective, but I think it does.

I’ve definitely complained about TDD before, because if you are in a time crunch it can feel very, very slow. “What do you mean I have to write code before I can write my code? This is bull!”. But this forest is a nice place. There’s time to do things right here.

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