fatsify核心功能示例测试!!!

node_modules/fastify/test/middleware.test.js

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+'use strict'
+
+const { test } = require('node:test')
+const Fastify = require('..')
+const {
+  FST_ERR_DEC_ALREADY_PRESENT
+} = require('../lib/errors')
+
+test('Should be able to override the default use API', t => {
+  t.plan(1)
+  const fastify = Fastify()
+  fastify.decorate('use', () => true)
+  t.assert.strictEqual(fastify.use(), true)
+})
+
+test('Cannot decorate use twice', t => {
+  t.plan(1)
+  const fastify = Fastify()
+  fastify.decorate('use', () => true)
+  try {
+    fastify.decorate('use', () => true)
+  } catch (err) {
+    t.assert.ok(err instanceof FST_ERR_DEC_ALREADY_PRESENT)
+  }
+})
+
+test('Encapsulation works', t => {
+  const fastify = Fastify()
+
+  fastify.register((instance, opts, done) => {
+    instance.decorate('use', () => true)
+    t.assert.strictEqual(instance.use(), true)
+    done()
+  })
+
+  fastify.ready()
+})