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backend/node_modules/fastify/test/reply-web-stream-locked.test.js

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+'use strict'
+
+const { ReadableStream } = require('node:stream/web')
+const { test, after } = require('node:test')
+const Fastify = require('..')
+
+test('reply.send(web ReadableStream) throws if locked', async t => {
+  t.plan(3)
+
+  const app = Fastify()
+  after(() => app.close())
+
+  app.get('/', (req, reply) => {
+    const rs = new ReadableStream({
+      start (controller) { controller.enqueue(new TextEncoder().encode('hi')); controller.close() }
+    })
+    // lock the stream
+    const reader = rs.getReader()
+    t.assert.strictEqual(rs.locked, true, 'stream is locked')
+
+    // sending a locked stream should trigger the Fastify error
+    reply.send(rs)
+    reader.releaseLock()
+  })
+
+  const res = await app.inject({ method: 'GET', url: '/' })
+  t.assert.strictEqual(res.statusCode, 500)
+  t.assert.deepStrictEqual(
+    JSON.parse(res.body),
+    {
+      statusCode: 500,
+      code: 'FST_ERR_REP_READABLE_STREAM_LOCKED',
+      error: 'Internal Server Error',
+      message: 'ReadableStream was locked. You should call releaseLock() method on reader before sending.'
+    }
+  )
+})