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

node_modules/undici/lib/dispatcher.js

@@ -0,0 +1,19 @@
+'use strict'
+
+const EventEmitter = require('events')
+
+class Dispatcher extends EventEmitter {
+  dispatch () {
+    throw new Error('not implemented')
+  }
+
+  close () {
+    throw new Error('not implemented')
+  }
+
+  destroy () {
+    throw new Error('not implemented')
+  }
+}
+
+module.exports = Dispatcher