Make tests retain 4GB less RAM (#80)

* Save 4 more gigabytes when running tests by not holding on to huge string

* Limit maximum heap size when running tests to ensure streaming doesn’t hold on to data

Author: sergv

zlib/test/Test.hs

@@ -289,8 +289,12 @@ test_exception = ioProperty $ do
 
 test_compress_large_chunk :: Property
 test_compress_large_chunk =
-  GZip.decompress (GZip.compress (BL.replicate len 0)) === BL.replicate len 0
+  counterexample
+    ("Expected " ++ show len ++ " zeros but got different result, please investigate manually")
+    (property test)
   where
+    test = GZip.decompress (GZip.compress (BL.replicate len 0)) == BL.replicate len 0
+
     len = case finiteBitSize (0 :: Int) of
       64 -> (1 `shiftL` 32) + 1
       _ -> 0 -- ignore it

zlib/zlib.cabal

@@ -130,3 +130,4 @@ test-suite tests
                    tasty            >= 0.8 && < 1.6,
                    tasty-quickcheck >= 0.8 && < 1
   ghc-options:     -Wall
+                   --with-rtsopts="-M1G"