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All of the exercises are based on providing a failing test suite for people to run and make pass, so we need to pick a testing framework. If there are multiple testing frameworks available, we will need to figure out which one is the best fit.
For people who will be doing the exercises, it's important to get them up and running as quickly as possible.
In general we prefer tools in the standard library if they're available, and if not we aim for a third party library that is widely used. If there is a choice between several common libraries, then consider a few factors:
Remember that all Exercism exercises are by nature very small, so there is no need for the complexity that real-world projects sometimes require.
As you make these decisions, document them in the track repository's README.md for contributors and maintainers.
In particular, when someone submits a contribution that goes against one of these decisions, it's very helpful to be able to point to not just the conclusion, but also a bit about why that decision was made.
That makes it easier to decide whether to just close the issue or pull request from the contributor, or whether
it is time to re-evaluate the decision based on new information.
The harder the decision was to make, the more important it is to document it thoroughly. (e.g. What trade-offs did you consider? What tipped your gut feeling in one direction or the other? What sealed the deal?)