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    <p>Unit tests aren't meant to replace functional/component tests. Unit tests are really focused, so they won't be hitting database, external services, etc. Integration tests does that, but you can have them really focused. The bottom line, is that on the specific question, the answer is that they don't replace those manual tests. Now, automated functional tests + automated component tests can certainly replace manual tests. It will depend a lot of the project and the approach to it on who will actually do those.</p> <p><strong>Update 1:</strong> Note that if developers are creating automated functional tests you still want to review that those have the appropriate coverage, complementing them as appropriate. Some developers create automated functional tests with their "unit" test framework, because they still have to do smoke tests regardless of the unit tests, and it really helps having those automated :) </p> <p><strong>Update 2:</strong> Unit testing isn't overkill for a small project, nor is automating the smoke tests or using TDD. What is overkill is having the team doing any of that for their first time on the small project. Doing any of those have an associated learning curve (specially unit testing or TDD), and not always will be done right at first. You also want someone who has been doing it for a while involved, to help avoid pitfalls and get pasts some coding challenges that aren't obvious when starting on it. The issue is that it isn't common for teams to have these skills.</p>
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