Developing test cases is one thing. Keeping efficient test cases with good coverage when functionality changes is another thing. The challenge with having poorly-crafted test scenarios is that as soon as production functionality changes, the tests need to change as well, requiring a lot of time and effort.

Crafting test cases requires the same attention and effort as production code. Experience shows that without this effort put in, tests contain a lot of duplication and multiple responsibilities. In the same way as for production code, test code requires refactoring.

It should be possible to change or extend test scenarios without much effort required. In particular the test data that changes needs to be represented effectively.

Maintainable tests are a prerequisite for enterprise projects that have proper test coverage and yet are flexible for changes in their business logic. Being able to adapt in a fast-moving world requires adjustable test scenarios as well.