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node_modules/fastify/test/diagnostics-channel/404.test.js

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+'use strict'
+
+const { test } = require('node:test')
+const diagnostics = require('node:diagnostics_channel')
+const Fastify = require('../..')
+const Request = require('../../lib/request')
+const Reply = require('../../lib/reply')
+
+test('diagnostics channel sync events fire in expected order', async t => {
+  t.plan(9)
+  let callOrder = 0
+  let firstEncounteredMessage
+
+  diagnostics.subscribe('tracing:fastify.request.handler:start', (msg) => {
+    t.assert.strictEqual(callOrder++, 0)
+    firstEncounteredMessage = msg
+    t.assert.ok(msg.request instanceof Request)
+    t.assert.ok(msg.reply instanceof Reply)
+  })
+
+  diagnostics.subscribe('tracing:fastify.request.handler:end', (msg) => {
+    t.assert.ok(msg.request instanceof Request)
+    t.assert.ok(msg.reply instanceof Reply)
+    t.assert.strictEqual(callOrder++, 1)
+    t.assert.strictEqual(msg, firstEncounteredMessage)
+  })
+
+  diagnostics.subscribe('tracing:fastify.request.handler:error', (msg) => {
+    t.assert.fail('should not trigger error channel')
+  })
+
+  const fastify = Fastify()
+  fastify.route({
+    method: 'GET',
+    url: '/',
+    handler: function (req, reply) {
+      reply.callNotFound()
+    }
+  })
+
+  const fastifyServer = await fastify.listen({ port: 0 })
+  t.after(() => { fastify.close() })
+
+  const response = await fetch(fastifyServer, {
+    method: 'GET'
+  })
+  t.assert.ok(!response.ok)
+  t.assert.strictEqual(response.status, 404)
+})