re: Clean, DRY, SOLID Spaghetti VIEW POST


Great write.

I don't quite get your point at TDD. Isn't writing your tests before the code already 'blind'?


In one sense, but tests are vastly simpler than production code in most cases, so its easier for us to get into the habit of subconsciously coding around our own "traps". As it is, in TDD, we're explicitly writing to satisfy the tests.

That's not necessarily a bad thing, of course - it's one of TDD's strengths - but rewriting the tests "blind" after writing the code makes it harder for us to avoid setting off bugs.

To put it another way, our initial tests define how the code is "supposed" to work. However, afterwards, when I don't remember exactly how my code is "supposed" to work, I instead write tests based on how I expect it to work...and then it doesn't work that way. I've more closely replicated real-world usage. I've actually done this many times, and it's uncovered quite a few bugs, memory leaks, and poor design decisions.


Thanks for the explanation.

In my experience, sometimes I do have code design prethoughts while writing unit tests. There's a danger that I purposefully write the tests the way it was because I want to shape it to the design I had in mind. Thus, writing the "trap" for myself.

I agree, though I think this problem will only likely surface on low level tests such as unit tests. That's why we couple Behevior Driven Development (BDD) automated tests with unit tests. To test the implementation of the unit tests and replicate the transactions as if how it will be used in production.

Normally, we'd write the acceptance tests (BDD) first, unit tests, then code.

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