Leveling Up - First cabal test suite

[JonathanLorimer]

file to edit: https://github.com/haskell/cabal-userguide/blob/main/src/leveling_up/02_first_cabal_test-suite.md

Brief Summary

The motivation for this chapter is to show users how to setup a test suite in cabal, how to test their library, and how to test their executable code. It would be helpful to mention how compilation works wrt test suites.

Resources

Old cabal user guide test reference