The goal isn't to refactor the current tests for only this purpose, but if we agree in using one, who write a new test or need to change any test could use it without asking at that moment, which always delays the progress.
On the other hand, we could decide to enforce the usage of the one agreed in the new tests and when the existent ones be drastically refactored.
Should consider to use any any assertion library for the test of this package?
In case that yes, which one
The goal isn't to refactor the current tests for only this purpose, but if we agree in using one, who write a new test or need to change any test could use it without asking at that moment, which always delays the progress.
On the other hand, we could decide to enforce the usage of the one agreed in the new tests and when the existent ones be drastically refactored.