Better assert in the node_modules tests

test/fixtures/node_modules/baz/index.js

@@ -1,13 +1,14 @@
 console.error(__filename);
 console.error(module.paths.join('\n')+'\n');
 // this should work, and get the one that doesn't throw
-require('bar');
+var assert = require('assert');
+assert.equal(require('bar'), require('../bar.js'));
 
 // since this is inside a node_modules folder,
 // it should be impossible to ever see /node_modules in the
 // lookup paths, since it's rooted on the uppermost node_modules
 // directory.
-require('assert').equal(-1, module.paths.indexOf('/node_modules'));
+assert.equal(-1, module.paths.indexOf('/node_modules'));
 
 // this should work, and get the one in ./node_modules/asdf.js
-require('asdf');
+assert.equal(require('asdf'), require('./node_modules/asdf.js'));

test/fixtures/node_modules/foo.js

@@ -1,3 +1,4 @@
 console.error(__filename);
 console.error(module.paths.join('\n')+'\n');
-require('baz');
+var assert = require('assert');
+assert.equal(require('baz'), require('./baz/index.js'));