Migrate the remaining parts of the exposed API to GhcMod a

test/ListSpec.hs

@@ -3,11 +3,11 @@ module ListSpec where
 import Control.Applicative
 import Language.Haskell.GhcMod
 import Test.Hspec
+import TestUtils
 
 spec :: Spec
 spec = do
-    describe "listModules" $ do
-        it "lists up module names" $ do
-            cradle <- findCradle
-            modules <- lines <$> listModules defaultOptions cradle
+    describe "modules" $ do
+        it "contains at least `Data.Map'" $ do
+            modules <- runD $ lines <$> modules
             modules `shouldContain` ["Data.Map"]