           promises = []
           files.forEach (file) ->
             promises.push q.nfcall(
-              fs.readFile.bind fs.readFile, file
+              fs.readFile, file
             ).then(
               (data) ->
                 expect(

    beforeEach (done) ->
      promises = [
        q.nfcall(
          fs.readFile.bind fs.readFile,
          "./tests/data/imports/main.css"
        ).then(
          (data) -> right.content = removeMapFile(

      promises = []
      targetFiles.forEach (file) ->
        promises.push q.nfcall(
          fs.readFile,
          path.join("./tests/data/multiple", file)
        ).then(
          (data) ->
