test: replace fixturesDir with fixtures methods

PR-URL: https://github.com/nodejs/node/pull/15967
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-fs-read-stream-inherit.js

@@ -1,12 +1,13 @@
 'use strict';
+
 const common = require('../common');
 
 const assert = require('assert');
 const fs = require('fs');
-const path = require('path');
+const fixtures = require('../common/fixtures');
 
-const fn = path.join(common.fixturesDir, 'elipses.txt');
-const rangeFile = path.join(common.fixturesDir, 'x.txt');
+const fn = fixtures.path('elipses.txt');
+const rangeFile = fixtures.path('x.txt');
 
 {
   let paused = false;