Is bootstrap a framework or a library?

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2. What is jest unit testing?
3. How do you install yarn jest?
4. Do jest tests run in parallel?
5. Which returns the value only once when mock function is called?
6. What is mock in Junit?
7. What happens when an error is not caught by the error boundary?
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Tags

1. #jquery
2. #front
3. #bootstrap
4. #areas
5. #javascript
6. #approach
7. #entirely
8. #angular
9. #whole
10. #framework
11. #customization
12. #pretty
13. #specific
14. #something
15. #based
16. #library