test: add regex check to test-module-loading

Also removes extraneous argument.

PR-URL: #11413
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>

test/sequential/test-module-loading.js

@@ -99,7 +99,8 @@ console.error('test name clashes');
 const my_path = require('../fixtures/path');
 assert.ok(my_path.path_func instanceof Function);
 // this one does not exist and should throw
-assert.throws(function() { require('./utils'); });
+assert.throws(function() { require('./utils'); },
+              /^Error: Cannot find module '.\/utils'$/);
 
 let errorThrown = false;
 try {
@@ -126,7 +127,7 @@ assert.strictEqual(require('../fixtures/registerExt.hello.world').test,
                    'passed');
 
 console.error('load custom file types that return non-strings');
-require.extensions['.test'] = function(module, filename) {
+require.extensions['.test'] = function(module) {
   module.exports = {
     custom: 'passed'
   };