tests: Test for eval plugin now show correct line in output

Using `HasCallStack`, `testCase` can no pinpoint the call location
instead of pointing inside the utility function.

Author: guibou

plugins/hls-eval-plugin/test/Main.hs

@@ -261,7 +261,7 @@ diffOffConfig =
     unObject (Object obj) = obj
     unObject _            = undefined
 
-evalInFile :: FilePath -> T.Text -> T.Text -> IO ()
+evalInFile :: HasCallStack => FilePath -> T.Text -> T.Text -> IO ()
 evalInFile fp e expected = runSessionWithServer evalPlugin testDataDir $ do
   doc <- openDoc fp "haskell"
   origin <- documentContents doc