         result_path = path.join("tests/results/glob", folder, "source.css")
         promises.push(
           q.nfcall(
-            fs.readFile.bind fs.readFile,
+            fs.readFile,
             path.join("./tests/data/glob", folder, "source.css")
           ).then(
             (data) ->

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

    before (done) ->
      targetPromises = [
        q.nfcall(
          fs.readFile,
          "./tests/data/single/source.css"
        ).then(
          (css) -> right.file = removeMapFile(css.toString "utf-8").trim()
        )
        q.nfcall(
          fs.readFile,
          "./tests/data/single/source.css.map"
        ).then(
          (map) ->
            right.sourcemap = JSON.parse(map.toString "utf-8")
            right.sourcemap.sources = right.sourcemap.sources.map(
              (file) -> path.relative(
                process.cwd(), path.resolve "./tests/data/single", file
