If you’re a developer, then you’ve already performed a software test, whether you realize it or not. When you write a piece of software, to see if it’s working, that’s testing.
When you create a webform, then submit the form to see if it successfully adds the data to the database; that’s testing. When you submit the same form again, with the wrong input, to see if it rejects the form and tells the user there’s a problem, that’s also testing but manual testing.
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