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Running tests

You can run your tests with stack, cabal, ghci or sensei. All of these options are discussed below.

Note: Using stack or cabal is slow. Use ghci or sensei for a faster edit-compile-test cycle.

With stack

Simply run:

$ stack test

With cabal

First make sure that you have a recent version of cabal-install (you need at least v3.0.0.0:

$ cabal --numeric-version
3.2.0.0

Then simply run:

$ cabal test --test-show-details=direct

With ghci

The fastest way to run your tests is with ghci. Make sure that .ghci is only writeable by you:

$ chmod go-w . .ghci

Then you can run your tests with:

$ cabal exec ghci test/Spec.hs
*Main> :main

After modifying code use:

*Main> :reload
*Main> :main

Note: :reload will be much faster than loading the code initially. This makes a big difference for larger projects.

With sensei

Using hspec/sensei is similar to using ghci, but it runs your tests automatically on file modifications. You don't have to invoke :reload and :main manually.

1. Install sensei with

   $ stack install sensei
   

   or

   $ cabal install sensei --installdir=$HOME/.local/bin
   

2. Make sure that .ghci is only writeable by you:

   $ chmod go-w . .ghci
   

3. Run sensei with

   $ stack exec sensei test/Spec.hs
   

   or

   $ cabal exec sensei test/Spec.hs