In an older but still relevant article on the Clean Coder Blog, Uncle Bob argues that the structure of your tests should not necessarly reflect the structure of your code.

The structure of the tests must not reflect the structure of the production code, because that much coupling makes the system fragile and obstructs refactoring. Rather, the structure of the tests must be independently designed so as to minimize the coupling to the production code.

https://blog.cleancoder.com/uncle-bob/2017/10/03/TestContravariance.html