Install libghc-hunit-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-hunit-doc
Description:
Haskell unit testing framework for GHC; documentation
HUnit is a unit testing framework for Haskell, inspired by the JUnit tool for Java, see:
Homepage: https://github.com/hspec/HUnit#readme
Version: 1.5.0.0-1
Section: universe/doc