gnu: Add ghc-hedgehog.

* gnu/packages/haskell-check.scm (ghc-hedgehog): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/haskell-check.scm

@@ -822,3 +822,47 @@ (define-public ghc-crypto-cipher-tests
 cryptographic ciphers, and is used by the test runners of various Haskell
 implementations of cryptographic ciphers.")
     (license license:bsd-3)))
+
+(define-public ghc-hedgehog
+  (package
+    (name "ghc-hedgehog")
+    (version "0.6.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "mirror://hackage/package/hedgehog/hedgehog-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "0xz10ycdm5vk9nrcym1fi83k19frfwqz18bz8bnpzwvaj0j41yfj"))))
+    (build-system haskell-build-system)
+    (inputs
+     `(("ghc-ansi-terminal" ,ghc-ansi-terminal-0.8)
+       ("ghc-async" ,ghc-async)
+       ("ghc-concurrent-output" ,ghc-concurrent-output)
+       ("ghc-exceptions" ,ghc-exceptions)
+       ("ghc-lifted-async" ,ghc-lifted-async)
+       ("ghc-mmorph" ,ghc-mmorph)
+       ("ghc-monad-control" ,ghc-monad-control)
+       ("ghc-pretty-show" ,ghc-pretty-show)
+       ("ghc-primitive" ,ghc-primitive)
+       ("ghc-random" ,ghc-random)
+       ("ghc-resourcet" ,ghc-resourcet)
+       ("ghc-semigroups" ,ghc-semigroups)
+       ("ghc-stm" ,ghc-stm)
+       ("ghc-th-lift" ,ghc-th-lift)
+       ("ghc-transformers-base" ,ghc-transformers-base)
+       ("ghc-wl-pprint-annotated"
+        ,ghc-wl-pprint-annotated)))
+    (home-page "https://hedgehog.qa")
+    (synopsis "Property-based testing in the spirt of QuickCheck")
+    (description
+     "Hedgehog is a property-based testing system, in the spirit of
+QuickCheck.  Hedgehog uses integrated shrinking, so shrinks obey the invariants
+of generated values by construction.
+
+To get started quickly, see the examples:
+@uref{https://github.com/hedgehogqa/haskell-hedgehog/tree/master/hedgehog-example}")
+    (license license:bsd-3)))