excerpts from article by Joseph Puopolo, An impassioned plea to other Start-up founders to use automated tests.

Working on the business side of the shop, I have fought against automated tests for a while. That all changed recently
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The conclusion I reached was that automated tests save developers time and let you deliver more. This was a painful admission, but a correct one.
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I have been in multiple start-ups where automated tests didn’t exist, and let me just say the QA overhead was astronomical.
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While it seems counter-intuitive, building tests saves you time in the long run. The knee jerk reaction is to spend your time building new features. I have had this reaction many times
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One of the biggest time sinks in development is finding the problem. With proper tests in place you can isolate and figure out where the issue is.
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With automated tests in place, it is easier for new developers coming into the system to understand code that they didn’t write.
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automated tests save time and help you get to market faster. If your goal is to rush to MVP without putting in place a scalable infrastructure that allows you to grow your code base, you are not only making a technical mistake but a business mistake.