add hw2

node_modules/on-exit-leak-free/test/fixtures/beforeExit.js

@@ -0,0 +1,33 @@
+'use strict'
+
+const { unregister, registerBeforeExit } = require('../..')
+const assert = require('assert')
+
+function setup () {
+  const obj = { foo: 'bar' }
+  registerBeforeExit(obj, shutdown)
+}
+
+let shutdownCalled = false
+let timeoutFinished = false
+function shutdown (obj, event) {
+  shutdownCalled = true
+  if (event === 'beforeExit') {
+    setTimeout(function () {
+      timeoutFinished = true
+      assert.strictEqual(obj.foo, 'bar')
+      unregister(obj)
+    }, 100)
+    process.on('beforeExit', function () {
+      assert.strictEqual(timeoutFinished, true)
+    })
+  } else {
+    throw new Error('different event')
+  }
+}
+
+setup()
+
+process.on('exit', function () {
+  assert.strictEqual(shutdownCalled, true)
+})