Function createSocketAndGetFirstMessage

test/browser/ws-api/ws.client.send.test.ts:59–80

(page: Page)

  )

  async function createSocketAndGetFirstMessage(page: Page) {
    await page.evaluate(async () => {
      const { setupWorker, ws } = window.msw
      const service = ws.link('wss://example.com')

      const worker = setupWorker(
        service.addEventListener('connection', ({ client }) => {
          // Send a message to the client as soon as it connects.
          client.send('hello world')
        }),
      )
      await worker.start()
    })

    return page.evaluate(async () => {
      const socket = new WebSocket('wss://example.com')
      return new Promise<string>((resolve, reject) => {
        socket.onmessage = (event) => resolve(event.data)
        socket.onerror = () => reject(new Error('WebSocket error'))
      }).finally(() => socket.close())
    })
  }

  const secondPage = await browser.newPage()
  await secondPage.goto(compilation.previewUrl)