Revert "Test the coverage of source values."

This reverts commit b658804.

Author: robrix

test/Data/Source/Spec.hs

@@ -72,9 +72,9 @@ testTree = Tasty.testGroup "Data.Source"
   ]
   where summarize src = do
           let lines = sourceLines src
-          cover  5 "empty"          $ nullSource src
-          cover 20 "single-line"    $ length lines == 1
-          cover 50 "multiple lines" $ length lines >  1
+          classify "empty"          $ nullSource src
+          classify "single-line"    $ length lines == 1
+          classify "multiple lines" $ length lines >  1
 
 spec :: Spec
 spec = do