refactoring for testing.

test/CheckSpec.hs

@@ -1,5 +1,6 @@
 module CheckSpec where
 
+import CabalApi
 import Check
 import Cradle
 import Expectation
@@ -11,6 +12,7 @@ spec = do
     describe "checkSyntax" $ do
         it "can check even if an executable depends on its library" $ do
             withDirectory "test/data/ghc-mod-check" $ do
-                cradle <- findCradle Nothing
+                (strVer,_) <- getGHCVersion
+                cradle <- findCradle Nothing strVer
                 res <- checkSyntax defaultOptions cradle "main.hs"
                 res `shouldBe` "main.hs:5:1:Warning: Top-level binding with no type signature: main :: IO ()\NUL\n"