Use hspec's parallel evaluation for test suite to speed up local testing

constrained-generators.cabal

@@ -138,6 +138,8 @@ test-suite constrained-tests
     -Wredundant-constraints
     -Wunused-packages
     -rtsopts
+    -threaded
+    -with-rtsopts=-N
 
   build-depends:
     QuickCheck >= 2.15.0.1,

test/Constrained/GraphSpec.hs

@@ -110,4 +110,4 @@ return []
 
 tests :: Bool -> Spec
 tests _nightly =
-  describe "Graph tests" $ sequence_ [ prop n (checkCoverage $ withMaxSuccess 1000 p) | (n, p) <- $allProperties ]
+  describe "Graph tests" $ parallel $ sequence_ [ prop n (checkCoverage $ withMaxSuccess 1000 p) | (n, p) <- $allProperties ]

test/Constrained/Tests.hs

@@ -58,7 +58,7 @@ testAll :: IO ()
 testAll = hspec $ tests False
 
 tests :: Bool -> Spec
-tests nightly =
+tests nightly = parallel $
   describe "constrained" . modifyMaxSuccess (\ms -> if nightly then ms * 10 else ms) $ do
     testSpec "signumPositive" signumPositive
     testSpec "setOfPairLetSpec" setOfPairLetSpec

test/Tests.hs

@@ -9,6 +9,6 @@ import Test.Hspec
 main :: IO ()
 main = do
   nightly <- isJust <$> lookupEnv "NIGHTLY"
-  hspec $ do
+  hspec $ parallel $ do
     Tests.tests nightly
     Graph.tests nightly