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backend/node_modules/fastify/test/diagnostics-channel/error-status.test.js

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+'use strict'
+
+const { test } = require('node:test')
+const Fastify = require('../..')
+const statusCodes = require('node:http').STATUS_CODES
+const diagnostics = require('node:diagnostics_channel')
+
+test('diagnostics channel error event should report correct status code', async (t) => {
+  t.plan(3)
+  const fastify = Fastify()
+  t.after(() => fastify.close())
+
+  let diagnosticsStatusCode
+
+  const channel = diagnostics.channel('tracing:fastify.request.handler:error')
+  const handler = (msg) => {
+    diagnosticsStatusCode = msg.reply.statusCode
+  }
+  channel.subscribe(handler)
+  t.after(() => channel.unsubscribe(handler))
+
+  fastify.get('/', async () => {
+    const err = new Error('test error')
+    err.statusCode = 503
+    throw err
+  })
+
+  const res = await fastify.inject('/')
+
+  t.assert.strictEqual(res.statusCode, 503)
+  t.assert.strictEqual(diagnosticsStatusCode, 503, 'diagnostics channel should report correct status code')
+  t.assert.strictEqual(diagnosticsStatusCode, res.statusCode, 'diagnostics status should match response status')
+})
+
+test('diagnostics channel error event should report 500 for errors without status', async (t) => {
+  t.plan(3)
+  const fastify = Fastify()
+  t.after(() => fastify.close())
+
+  let diagnosticsStatusCode
+
+  const channel = diagnostics.channel('tracing:fastify.request.handler:error')
+  const handler = (msg) => {
+    diagnosticsStatusCode = msg.reply.statusCode
+  }
+  channel.subscribe(handler)
+  t.after(() => channel.unsubscribe(handler))
+
+  fastify.get('/', async () => {
+    throw new Error('plain error without status')
+  })
+
+  const res = await fastify.inject('/')
+
+  t.assert.strictEqual(res.statusCode, 500)
+  t.assert.strictEqual(diagnosticsStatusCode, 500, 'diagnostics channel should report 500 for plain errors')
+  t.assert.strictEqual(diagnosticsStatusCode, res.statusCode, 'diagnostics status should match response status')
+})
+
+test('diagnostics channel error event should report correct status with custom error handler', async (t) => {
+  t.plan(3)
+  const fastify = Fastify()
+  t.after(() => fastify.close())
+
+  let diagnosticsStatusCode
+
+  const channel = diagnostics.channel('tracing:fastify.request.handler:error')
+  const handler = (msg) => {
+    diagnosticsStatusCode = msg.reply.statusCode
+  }
+  channel.subscribe(handler)
+  t.after(() => channel.unsubscribe(handler))
+
+  fastify.setErrorHandler((error, request, reply) => {
+    reply.status(503).send({ error: error.message })
+  })
+
+  fastify.get('/', async () => {
+    throw new Error('handler error')
+  })
+
+  const res = await fastify.inject('/')
+
+  // Note: The diagnostics channel fires before the custom error handler runs,
+  // so it reports 500 (default) rather than 503 (set by custom handler).
+  // This is expected behavior - the error channel reports the initial error state.
+  t.assert.strictEqual(res.statusCode, 503)
+  t.assert.strictEqual(diagnosticsStatusCode, 500, 'diagnostics channel reports status before custom handler')
+  t.assert.notStrictEqual(diagnosticsStatusCode, res.statusCode, 'custom handler can change status after diagnostics')
+})
+
+test('Error.status property support', (t, done) => {
+  t.plan(4)
+  const fastify = Fastify()
+  t.after(() => fastify.close())
+  const err = new Error('winter is coming')
+  err.status = 418
+
+  diagnostics.subscribe('tracing:fastify.request.handler:error', (msg) => {
+    t.assert.strictEqual(msg.error.message, 'winter is coming')
+  })
+
+  fastify.get('/', () => {
+    return Promise.reject(err)
+  })
+
+  fastify.inject({
+    method: 'GET',
+    url: '/'
+  }, (error, res) => {
+    t.assert.ifError(error)
+    t.assert.strictEqual(res.statusCode, 418)
+    t.assert.deepStrictEqual(
+      {
+        error: statusCodes['418'],
+        message: err.message,
+        statusCode: 418
+      },
+      JSON.parse(res.payload)
+    )
+    done()
+  })
+})