diff --git a/src/Zifter/Stack.hs b/src/Zifter/Stack.hs
--- a/src/Zifter/Stack.hs
+++ b/src/Zifter/Stack.hs
@@ -5,7 +5,9 @@
 import Data.List (isInfixOf)
 import Path
 import Path.IO
+import Safe
 import System.Exit (ExitCode(..))
+import qualified System.FilePath as FP (splitPath)
 import System.IO
 import System.Process
 
@@ -41,7 +43,7 @@
     (_, fs) <- liftIO $ listDirRecur rd
     let cabalFiles =
             filter (not . isInfixOf ".stack-work" . toFilePath) $
-            filter ((== ".cabal") . fileExtension) fs
+            filter (not . hidden) $ filter ((== ".cabal") . fileExtension) fs
     (concat <$>) $
         forM cabalFiles $ \cabalFile -> do
             pd <-
@@ -64,12 +66,21 @@
     let stack :: String -> Zift ()
         stack args = do
             let buildCmd = unwords ["stack", args]
-            bec <-
-                liftIO $ do
-                    (_, _, _, bph) <-
-                        createProcess
-                            ((shell buildCmd) {cwd = Just $ toFilePath rd})
-                    waitForProcess bph
+            (_, mouth, merrh, bph) <-
+                liftIO $
+                createProcess
+                    ((shell buildCmd)
+                     { cwd = Just $ toFilePath rd
+                     , std_out = CreatePipe
+                     , std_err = CreatePipe
+                     })
+            bec <- liftIO $ waitForProcess bph
+            case mouth of
+                Nothing -> pure ()
+                Just outh -> liftIO (hGetContents outh) >>= printZift
+            case merrh of
+                Nothing -> pure ()
+                Just errh -> liftIO (hGetContents errh) >>= printZift
             case bec of
                 ExitFailure c ->
                     fail $ unwords [buildCmd, "failed with exit code", show c]
@@ -80,4 +91,12 @@
     forM_ tups $ \(package_, targets) -> do
         stack $ unwords ["clean", package_]
         forM_ targets $ \target ->
-            stack $ unwords ["build --pedantic --haddock --test", target]
+            stack $
+            unwords
+                [ "build --pedantic --haddock --test"
+                , target
+                , "--test-arguments='--fail-fast --seed=42'"
+                ]
+
+hidden :: Path Abs t -> Bool
+hidden = any ((Just '.' ==) . headMay) . FP.splitPath . toFilePath
diff --git a/zifter-stack.cabal b/zifter-stack.cabal
--- a/zifter-stack.cabal
+++ b/zifter-stack.cabal
@@ -1,5 +1,5 @@
 name: zifter-stack
-version: 0.0.0.2
+version: 0.0.0.4
 cabal-version: >=1.10
 build-type: Simple
 license: MIT
@@ -18,13 +18,14 @@
         Zifter.Stack
     build-depends:
         base >=4.9 && <=5,
+        Cabal >=1.24 && <1.25,
         process -any,
         filepath >=1.4 && <1.5,
         directory -any,
         zifter >=0.0 && <0.1,
         path >=0.5 && <0.6,
         path-io >=1.2 && <1.3,
-        Cabal >=1.24 && <1.25
+        safe >=0.3 && <0.4
     default-language: Haskell2010
     hs-source-dirs: src/
     ghc-options: -Wall