mac> stack build :helloworld-test
helloworld-0.1.0.0: unregistering (local file changes: app/Main.hs helloworld.cabal src/Lib.hs test/Spec.hs)
helloworld-0.1.0.0: configure (lib + exe + test)
Configuring helloworld-0.1.0.0...
helloworld-0.1.0.0: build (lib + exe + test)
Preprocessing library helloworld-0.1.0.0...
[1 of 1] Compiling Lib              ( src/Lib.hs, .stack-work/dist/x86_64-osx/Cabal-1.22.4.0/build/Lib.o )
In-place registering helloworld-0.1.0.0...
Preprocessing executable 'helloworld-exe' for helloworld-0.1.0.0...
[1 of 1] Compiling Main             ( app/Main.hs, .stack-work/dist/x86_64-osx/Cabal-1.22.4.0/build/helloworld-exe/helloworld-exe-tmp/Main.o )
Linking .stack-work/dist/x86_64-osx/Cabal-1.22.4.0/build/helloworld-exe/helloworld-exe ...
Preprocessing test suite 'helloworld-test' for helloworld-0.1.0.0...
[1 of 1] Compiling Main             ( test/Spec.hs, .stack-work/dist/x86_64-osx/Cabal-1.22.4.0/build/helloworld-test/helloworld-test-tmp/Main.o )
Linking .stack-work/dist/x86_64-osx/Cabal-1.22.4.0/build/helloworld-test/helloworld-test ...
helloworld-0.1.0.0: copy/register
Installing library in
/Users/kevin/Dev/Haskell/helloworld/.stack-work/install/x86_64-osx/lts-3.18/7.10.2/lib/x86_64-osx-ghc-7.10.2/helloworld-0.1.0.0-Eoi7mdVvGqQF557Lat5ZX0
Installing executable(s) in
/Users/kevin/Dev/Haskell/helloworld/.stack-work/install/x86_64-osx/lts-3.18/7.10.2/bin
Registering helloworld-0.1.0.0...
helloworld-0.1.0.0: test (suite: helloworld-test)
Progress: 1/2Test suite not yet implemented
Completed all 2 actions.