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|
{-# LANGUAGE CPP #-}
{-# LANGUAGE FlexibleInstances #-}
{- |
Module : Tests.Helpers
Copyright : © 2006-2021 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley@edu>
Stability : alpha
Portability : portable
Utility functions for the test suite.
-}
module Tests.Helpers ( test
, TestResult(..)
, showDiff
, (=?>)
, purely
, ToString(..)
, ToPandoc(..)
)
where
import Data.Algorithm.Diff
import qualified Data.Map as M
import Data.Text (Text, unpack)
import System.Exit
import Test.Tasty
import Test.Tasty.HUnit
import Text.Pandoc.Builder (Blocks, Inlines, doc, plain)
import Text.Pandoc.Class
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Text.Pandoc.Shared (trimr)
import Text.Pandoc.Writers.Native (writeNative)
import Text.Printf
test :: (ToString a, ToString b, ToString c, HasCallStack)
=> (a -> b) -- ^ function to test
-> String -- ^ name of test case
-> (a, c) -- ^ (input, expected value)
-> TestTree
test fn name (input, expected) =
testCase name' $ assertBool msg (actual' == expected')
where msg = nl ++ dashes "input" ++ nl ++ input' ++ nl ++
dashes "result" ++ nl ++
unlines (map vividize diff) ++
dashes ""
nl = "\n"
name' = if length name > 54
then take 52 name ++ "..." -- avoid wide output
else name
input' = toString input
actual' = lines $ toString $ fn input
expected' = lines $ toString expected
diff = getDiff expected' actual'
dashes "" = replicate 72 '-'
dashes x = replicate (72 - length x - 5) '-' ++ " " ++ x ++ " ---"
data TestResult = TestPassed
| TestError ExitCode
| TestFailed String FilePath [Diff String]
deriving (Eq)
instance Show TestResult where
show TestPassed = "PASSED"
show (TestError ec) = "ERROR " ++ show ec
show (TestFailed cmd file d) = '\n' : dash ++
"\n--- " ++ file ++
"\n+++ " ++ cmd ++ "\n" ++ showDiff (1,1) d ++
dash
where dash = replicate 72 '-'
showDiff :: (Int,Int) -> [Diff String] -> String
showDiff _ [] = ""
showDiff (l,r) (First ln : ds) =
printf "+%4d " l ++ ln ++ "\n" ++ showDiff (l+1,r) ds
showDiff (l,r) (Second ln : ds) =
printf "-%4d " r ++ ln ++ "\n" ++ showDiff (l,r+1) ds
showDiff (l,r) (Both _ _ : ds) =
showDiff (l+1,r+1) ds
vividize :: Diff String -> String
vividize (Both s _) = " " ++ s
vividize (First s) = "- " ++ s
vividize (Second s) = "+ " ++ s
purely :: (b -> PandocPure a) -> b -> a
purely f = either (error . show) id . runPure . f
infix 5 =?>
(=?>) :: a -> b -> (a,b)
x =?> y = (x, y)
class ToString a where
toString :: a -> String
instance ToString Pandoc where
toString d = unpack $
purely (writeNative def{ writerTemplate = s }) $ toPandoc d
where s = case d of
(Pandoc (Meta m) _)
| M.null m -> Nothing
| otherwise -> Just mempty -- need this to get meta output
instance ToString Blocks where
toString = unpack . purely (writeNative def) . toPandoc
instance ToString Inlines where
toString = unpack . trimr . purely (writeNative def) . toPandoc
instance ToString String where
toString = id
instance ToString Text where
toString = unpack
class ToPandoc a where
toPandoc :: a -> Pandoc
instance ToPandoc Pandoc where
toPandoc = id
instance ToPandoc Blocks where
toPandoc = doc
instance ToPandoc Inlines where
toPandoc = doc . plain
|
