test: move to common.fixtures

PR-URL: nodejs/node#15987
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>

Author: JustinBeckwith

test/parallel/test-module-loading-globalpaths.js

@@ -1,5 +1,6 @@
 'use strict';
 const common = require('../common');
+const fixtures = require('../common/fixtures');
 const assert = require('assert');
 const path = require('path');
 const fs = require('fs');
@@ -33,8 +34,7 @@ if (process.argv[2] === 'child') {
     assert.strictEqual(child.trim(), expectedString);
   };
 
-  const testFixturesDir = path.join(common.fixturesDir,
-                                    path.basename(__filename, '.js'));
+  const testFixturesDir = fixtures.path(path.basename(__filename, '.js'));
 
   const env = Object.assign({}, process.env);
   // Turn on module debug to aid diagnosing failures.