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node_modules/fastify/test/async-dispose.test.js

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+'use strict'
+
+const { test } = require('node:test')
+const Fastify = require('../fastify')
+
+// asyncDispose doesn't exist in node <= 16
+test('async dispose should close fastify', { skip: !('asyncDispose' in Symbol) }, async t => {
+  t.plan(2)
+
+  const fastify = Fastify()
+
+  await fastify.listen({ port: 0 })
+
+  t.assert.strictEqual(fastify.server.listening, true)
+
+  // the same as syntax sugar for
+  // await using app = fastify()
+  await fastify[Symbol.asyncDispose]()
+  t.assert.strictEqual(fastify.server.listening, false)
+})