applied-fp-course/level03

Level 03

In this exercise we're going to add some tests to our application. Because types are awesome, and tests are pretty good. But types AND tests is pretty much perfect.

These tests will not be awe inspiring, this exercise is primarily to introduce you to adding tests to your Haskell application. The setup of the Cabal file is already completed for you, but will be covered.

As is to be expected, there are multiple testing frameworks and packages available but we will only cover one here. We will use the HSpec framework, with the hspec-wai package to make our lives a bit easier.

Including Test Library Dependencies and Running the Tests

For a cabal sandbox:

$ cabal sandbox init
$ cabal install --only-dependencies --enable-tests
$ cabal configure --enable-tests
$ cabal test

For a stack environment:

$ stack build --test

To load the tests in the REPL:

# Cabal
$ cabal repl level03-tests

# Stack
$ stack ghci level03:level03-tests

To run the tests in the repl:

*Main> :main

Start in tests/Test.hs.