hspec-megaparsec-0.2.0: tests/Main.hs

--
-- Hspec Megaparsec tests.
--
-- Copyright © 2016 Mark Karpov
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
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--   this list of conditions and the following disclaimer.
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-- * Redistributions in binary form must reproduce the above copyright
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-- * Neither the name Mark Karpov nor the names of contributors may be used
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{-# LANGUAGE CPP #-}

module Main (main) where

import Data.List.NonEmpty (NonEmpty (..))
import Test.Hspec
import Test.Hspec.Megaparsec
import Text.Megaparsec
import Text.Megaparsec.String
import qualified Data.Set as E

#if !MIN_VERSION_base(4,8,0)
import Control.Applicative ((<*))
#endif

-- | Toy tests, just an example of usage.

main :: IO ()
main = hspec $ do
  describe "shouldParse" $
    it "works" $
      parse (letterChar :: Parser Char) "" "x" `shouldParse` 'x'
  describe "parseSatisfies" $
    it "works" $
      parse (many punctuationChar :: Parser String) "" "?!!"
        `parseSatisfies` ((== 3) . length)
  describe "shouldFailOn" $
    it "works" $
      parse (char 'x' :: Parser Char) "" `shouldFailOn` "a"
  describe "shouldSucceedOn" $
    it "works" $
      parse (char 'x' :: Parser Char) "" `shouldSucceedOn` "x"
  describe "shouldFailWith" $
    it "works" $
      parse (char 'x' :: Parser Char) "" "b" `shouldFailWith`
        ParseError
          { errorPos        = initialPos "" :| []
          , errorUnexpected = E.singleton (Tokens $ 'b' :| [])
          , errorExpected   = E.singleton (Tokens $ 'x' :| [])
          , errorCustom     = E.empty }
  describe "failsLeaving" $
    it "works" $
      runParser' (many (char 'x') <* eof :: Parser String) (initialState "xxa")
        `failsLeaving` "a"
  describe "succeedsLeaving" $
    it "works" $
      runParser' (many (char 'x') :: Parser String) (initialState "xxa")
        `succeedsLeaving` "a"