Exercise solution: These identity test
Exercise
At this point, you should write tests for a Bifunctor
for These
. Rather than adding a dependency on the these
package, we encourage you to add the type to your Lib
module along with Functor
and 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.