I've been coding for over 20 years now! (WOAH, do I feel old)
I've touched just about every resource imaginable under the Sun (too bad they were bought out by Oracle)
1) Any time you add "todo" notes
2) any time you don't add unit tests with new features
3) any time you don't add documentation with new features
4) any time you don't test for edge case input
For #4, I'm currently working on a document, at least for PHP (but can apply to others), that shows a ton of different data types and values that can be passed into a function which are generally overlooked or the developer simply doesn't know about them. Is great to unit test edge cases like these to help prevent bugs. I'll have more on this when the document is live!
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1) Any time you add "todo" notes
2) any time you don't add unit tests with new features
3) any time you don't add documentation with new features
4) any time you don't test for edge case input
For #4, I'm currently working on a document, at least for PHP (but can apply to others), that shows a ton of different data types and values that can be passed into a function which are generally overlooked or the developer simply doesn't know about them. Is great to unit test edge cases like these to help prevent bugs. I'll have more on this when the document is live!