Pass the buildDir as first argument to test suite.

Allows test suite to work with cabal sandboxes.
Previously we hard-coded the build directory.

Setup.hs

@@ -3,13 +3,15 @@
 import Distribution.Simple
 import Distribution.Simple.PreProcess
 import Distribution.Simple.Setup
-         (copyDest, copyVerbosity, fromFlag, installVerbosity, BuildFlags(..))
+         (copyDest, copyVerbosity, fromFlag, installVerbosity, BuildFlags(..),
+          TestFlags(..))
 import Distribution.PackageDescription (PackageDescription(..), Executable(..))
 import Distribution.Simple.LocalBuildInfo
          (LocalBuildInfo(..), absoluteInstallDirs)
 import Distribution.Verbosity ( Verbosity, silent )
-import Distribution.Simple.InstallDirs (mandir, CopyDest (NoCopyDest))
+import Distribution.Simple.InstallDirs (mandir, CopyDest (NoCopyDest), toPathTemplate)
 import Distribution.Simple.Utils (installOrdinaryFiles, info)
+import Distribution.Simple.Test (test)
 import Prelude hiding (catch)
 import System.Process ( rawSystem )
 import System.FilePath ( (</>) )
@@ -20,6 +22,10 @@ main :: IO ()
 main = do
   defaultMainWithHooks $ simpleUserHooks {
       postBuild = makeManPages
+    , testHook = \pkg lbi _ flags ->
+         -- pass build directory as first argument to test program
+         test pkg lbi flags{ testOptions =
+               toPathTemplate (buildDir lbi) : testOptions flags }
     , postCopy = \ _ flags pkg lbi ->
          installManpages pkg lbi (fromFlag $ copyVerbosity flags)
               (fromFlag $ copyDest flags)

tests/Tests/Old.hs

@@ -3,7 +3,7 @@ module Tests.Old (tests) where
 import Test.Framework (testGroup, Test )
 import Test.Framework.Providers.HUnit
 import Test.HUnit ( assertBool )
-
+import System.Environment ( getArgs )
 import System.IO ( openTempFile, stderr )
 import System.Process ( runProcess, waitForProcess )
 import System.FilePath ( (</>), (<.>) )
@@ -22,9 +22,6 @@ import Text.Printf
 readFileUTF8 :: FilePath -> IO String
 readFileUTF8 f = B.readFile f >>= return . toStringLazy
 
-pandocPath :: FilePath
-pandocPath = ".." </> "dist" </> "build" </> "pandoc" </> "pandoc"
-
 data TestResult = TestPassed
                 | TestError ExitCode
                 | TestFailed String FilePath [Diff String]
@@ -209,6 +206,11 @@ testWithNormalize  :: (String -> String) -- ^ Normalize function for output
                    -> FilePath  -- ^ Norm (for test results) filepath
                    -> Test
 testWithNormalize normalizer testname opts inp norm = testCase testname $ do
+  args <- getArgs
+  let buildDir = case args of
+                      (x:_) -> ".." </> x
+                      _     -> error "test-pandoc: missing buildDir argument"
+  let pandocPath = buildDir </> "pandoc" </> "pandoc"
   (outputPath, hOut) <- openTempFile "" "pandoc-test"
   let inpPath = inp
   let normPath = norm

tests/test-pandoc.hs

@@ -38,4 +38,7 @@ tests = [ testGroup "Old" Tests.Old.tests
 main :: IO ()
 main = do
   setLocaleEncoding utf8
-  inDirectory "tests" $ defaultMain tests
+  -- we ignore command-line arguments, since we're having cabal pass
+  -- the build directory as first argument, and we don't want test-framework
+  -- to choke on that.
+  inDirectory "tests" $ defaultMainWithArgs tests []