Unit testing is the first line of defense against bugs. This level of protection is essential as it lays the foundation for the following testing processes: integration tests, acceptance testing, and finally manual testing, including exploratory testing.
In this article, I will shed some light on what differentiates unit testing from other methods and will bring examples of when we can or cannot do without unit testing. We’ll also touch upon automation testing, which plays an important role in ensuring code reliability and quality.
https://dzone.com/articles/optimizing-software-quality-unit-testing-and-automation
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