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コードの整理とプロジェクトのビルド QuickCheckを使ったプロパティテスト QuickCheckによるプロパティテスト モジュール

入門Haskellプログラミング (Will Kurt(著)、株式会社クイープ(監修、翻訳)、翔泳社)のUNIT6(コードの整理とプロジェクトのビルド)、LESSON 36(QuickCheckを使ったプロパティテスト)、36.3(QuickCheckによるプロパティテスト)、QuickCheck、クイックチェック 36-5の解答を求めてみる。

palindrome-testing/package.yaml

name:                palindrome-testing
version:             0.1.0.0
github:              "githubuser/palindrome-testing"
license:             BSD3
author:              "Author name here"
maintainer:          "example@example.com"
copyright:           "2022 Author name here"

extra-source-files:
- README.md
- CHANGELOG.md

# Metadata used when publishing your package
# synopsis:            Short description of your package
# category:            Web

# To avoid duplicated efforts in documentation and dealing with the
# complications of embedding Haddock markup inside cabal files, it is
# common to point users to the README.md file.
description:         Please see the README on GitHub at <https://github.com/githubuser/palindrome-testing#readme>

dependencies:
- base >= 4.7 && < 5

ghc-options:
- -Wall
- -Wcompat
- -Widentities
- -Wincomplete-record-updates
- -Wincomplete-uni-patterns
- -Wmissing-export-lists
- -Wmissing-home-modules
- -Wpartial-fields
- -Wredundant-constraints

library:
  source-dirs: src

executables:
  palindrome-testing-exe:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - palindrome-testing

tests:
  palindrome-testing-test:
    main:                Spec.hs
    source-dirs:         test
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - palindrome-testing
    - QuickCheck

palindrome-testing/palindrome-testing.cabal

cabal-version: 1.12

-- This file has been generated from package.yaml by hpack version 0.34.4.
--
-- see: https://github.com/sol/hpack

name:           palindrome-testing
version:        0.1.0.0
description:    Please see the README on GitHub at <https://github.com/githubuser/palindrome-testing#readme>
homepage:       https://github.com/githubuser/palindrome-testing#readme
bug-reports:    https://github.com/githubuser/palindrome-testing/issues
author:         Author name here
maintainer:     example@example.com
copyright:      2022 Author name here
license:        BSD3
license-file:   LICENSE
build-type:     Simple
extra-source-files:
    README.md
    CHANGELOG.md

source-repository head
  type: git
  location: https://github.com/githubuser/palindrome-testing

library
  exposed-modules:
      Lib
  other-modules:
      Paths_palindrome_testing
  hs-source-dirs:
      src
  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
  build-depends:
      base >=4.7 && <5
  default-language: Haskell2010

executable palindrome-testing-exe
  main-is: Main.hs
  other-modules:
      Paths_palindrome_testing
  hs-source-dirs:
      app
  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
  build-depends:
      base >=4.7 && <5
    , palindrome-testing
  default-language: Haskell2010

test-suite palindrome-testing-test
  type: exitcode-stdio-1.0
  main-is: Spec.hs
  other-modules:
      Paths_palindrome_testing
  hs-source-dirs:
      test
  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
  build-depends:
      QuickCheck
    , base >=4.7 && <5
    , palindrome-testing
  default-language: Haskell2010

palindrome-testing/test/Spec.hs

import Lib (isPalindrome)
import Test.QuickCheck (quickCheck)

prop_reverseInvariant :: String -> Bool
prop_reverseInvariant text =
  isPalindrome text == isPalindrome (reverse text)

main :: IO ()
main = do
  quickCheck prop_reverseInvariant
  putStrLn "done!"

palindrome-testing/src/Lib.hs

module Lib
  ( isPalindrome,
  )
where

isPalindrome :: String -> Bool
isPalindrome text =
  let cleanText = filter (not . (`elem` ['!', '.'])) text
   in cleanText == reverse cleanText

入出力結果(Terminal, Zsh)

% stack test
palindrome-testing-0.1.0.0: unregistering (local file changes: test/Spec.hs)
palindrome-testing> build (lib + exe + test)
Preprocessing library for palindrome-testing-0.1.0.0..
Building library for palindrome-testing-0.1.0.0..
ld: warning: -undefined dynamic_lookup may not work with chained fixups
Preprocessing test suite 'palindrome-testing-test' for palindrome-testing-0.1.0.0..
Building test suite 'palindrome-testing-test' for palindrome-testing-0.1.0.0..
[2 of 2] Compiling Main
Linking .stack-work/dist/x86_64-osx/Cabal-3.4.1.0/build/palindrome-testing-test/palindrome-testing-test ...
Preprocessing executable 'palindrome-testing-exe' for palindrome-testing-0.1.0.0..
Building executable 'palindrome-testing-exe' for palindrome-testing-0.1.0.0..
palindrome-testing> copy/register
Installing library in /Users/…/palindrome-testing/.stack-work/install/x86_64-osx/dd0ba1c274e73dc536fbe6c0a59722f85fb3bc32a983d13f60410ac8cb68772f/9.0.2/lib/x86_64-osx-ghc-9.0.2/palindrome-testing-0.1.0.0-6z19mBUSTIEBTbBBcZFRNH
Installing executable palindrome-testing-exe in /Users/…/palindrome-testing/.stack-work/install/x86_64-osx/dd0ba1c274e73dc536fbe6c0a59722f85fb3bc32a983d13f60410ac8cb68772f/9.0.2/bin
Registering library for palindrome-testing-0.1.0.0..
palindrome-testing> test (suite: palindrome-testing-test)
                                
+++ OK, passed 100 tests.
done!

palindrome-testing> Test suite palindrome-testing-test passed
Completed 2 action(s).
%