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Ditto. Couldn't agree more, in fact, I was going to write something very similar.

At high level also, Start-ups do need a TDD philosophy. For Start-up business ideas, the market is the test suite (to take the software analogy further) that is already there and changing the execution plan to make sure you pass those tests is vital.

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I'm not sure I agree that the market makes a great test suite. It kinda hurts when you fail.

But yeah, there's other things you can use, like - A/B testing (for web apps). You can automate "code smell" detectors, and get a continuous graph on how good your code seems to be.

Of course, things like converters and math functions (anything non-GUI) can benefit from unit tests.

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