Functional and Regression Testing are essential components of all testing strategies. Functional Testing's purpose is to test usability, accessibility, and other requirements. Regression Testing makes sure that the new version of the product works even after all the changes have been made.
https://medium.com/@mariaa.martin333/optimizing-regression-and-functional-testing-for-agile-ef071d8e4312
Agile methodology is a type of project management approach that can be used to develop software. It also applies where the requirements and solutions are created through the collaboration of cross-functional and self-systemized teams with their users.
User acceptance testing ensures that the end product is all set to be released. This testing type should not be ignored mainly because the end-users who will be testing the software product or application are the ones who understand what the product is and for whom it is being developed and eventually benefit the businesses and individuals. ...
It is a software tool that provides a comprehensive platform to write and run unit tests, by strategically using JavaScript language.It provides a foundation on which tests can be built and also provides the functionality to execute the tests.
https://dev.to/woodjessica/what-are-the-best-#javascript-unit-testing-frameworks-356l