It's all tradeoffs. If it's test data taking up space, it's useful to have the tests tracked along side the source so it's reasonable to put it in the repositor

It's all tradeoffs. If it's test data taking up space, it's useful to have the tests tracked along side the source so it's reasonable to put it in the repository. It could be put in a separate git repository and then tracked as a submodule, but it adds a bit of complexity for arguably minimal gain (developers need the tests anyway so it's only really helpful for users who want to download the sources and not the tests). Something like git lfs could maybe have a use but it also adds complexity. Unless they expect it to grow into the GB range personally I like the decision to just put it directly in the repository.