Exercise solution: These identity test
At this point, you should write tests for a
These. Rather than adding a dependency on the
these package, we encourage you to add the type to your
Lib module along with
Bifunctor instances for that type, without importing it from the package.
You may have these instances left over from a previous lesson; feel free to reuse them. Add the
these_id test to your
Bifunctor Identity Tests group.