Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/resolve/index.js

@@ -0,0 +1,6 @@
+var async = require('./lib/async');
+async.core = require('./lib/core');
+async.isCore = require('./lib/is-core');
+async.sync = require('./lib/sync');
+
+module.exports = async;