It appears that the repository has undergone several changes and renamings:

backend/node_modules/resolve/test/subdirs.js

@@ -1,13 +0,0 @@
-var test = require('tape');
-var resolve = require('../');
-var path = require('path');
-
-test('subdirs', function (t) {
-    t.plan(2);
-
-    var dir = path.join(__dirname, '/subdirs');
-    resolve('a/b/c/x.json', { basedir: dir }, function (err, res) {
-        t.ifError(err);
-        t.equal(res, path.join(dir, 'node_modules/a/b/c/x.json'));
-    });
-});