test for Cabal where exec depends on its lib and its fix code.

test/CheckSpec.hs

@@ -0,0 +1,14 @@
+module CheckSpec where
+
+import Test.Hspec
+import Check
+import Expectation
+import Types
+
+spec :: Spec
+spec = do
+    describe "checkSyntax" $ do
+        it "can check even if an executable depends on its library" $ do
+            withDirectory "test/data/ghc-mod-check" $ do
+                res <- checkSyntax defaultOptions "main.hs"
+                res `shouldBe` "main.hs:5:1:Warning:Top-level binding with no type signature: main :: IO ()\NUL\n"