test: add inline flight response reuse test

test/integration/react-streaming-and-server-components/test/rsc.js

@@ -30,6 +30,18 @@ export default function (context, { runtime, env }) {
     expect(homeHTML).toContain('foo.client')
   })
 
+  it('should reuse the inline flight response without sending extra requests', async () => {
+    let hasFlightRequest = false
+    const browser = await webdriver(context.appPort, '/')
+    browser.on('request', (request) => {
+      const url = request.url()
+      if (/__flight__=1/.test(url)) {
+        hasFlightRequest = true
+      }
+    })
+    expect(hasFlightRequest).toBe(false)
+  })
+
   it('should support multi-level server component imports', async () => {
     const html = await renderViaHTTP(context.appPort, '/multi')
     expect(html).toContain('bar.server.js:')
@@ -127,14 +139,13 @@ export default function (context, { runtime, env }) {
     const content = 'custom-404-page'
     const page404HTML = await renderViaHTTP(context.appPort, '/404')
     const pageUnknownHTML = await renderViaHTTP(context.appPort, '/no.where')
+    let browser = await webdriver(context.appPort, '/404')
+    const hydrated404Content = await browser.waitForElementByCss(id).text()
+    browser = await webdriver(context.appPort, '/no.where')
+    const hydratedUnknownContent = await browser.waitForElementByCss(id).text()
 
-    const page404Browser = await webdriver(context.appPort, '/404')
-    const pageUnknownBrowser = await webdriver(context.appPort, '/no.where')
-
-    expect(await page404Browser.waitForElementByCss(id).text()).toBe(content)
-    expect(await pageUnknownBrowser.waitForElementByCss(id).text()).toBe(
-      content
-    )
+    expect(hydrated404Content).toBe(content)
+    expect(hydratedUnknownContent).toBe(content)
 
     expect(getNodeBySelector(page404HTML, id).text()).toBe(content)
     expect(getNodeBySelector(pageUnknownHTML, id).text()).toBe(content)

test/lib/browsers/base.ts

@@ -72,7 +72,7 @@ export class BrowserInterface {
   }
   on(event: Event, cb: (...args: any[]) => void) {}
   off(event: Event, cb: (...args: any[]) => void) {}
-  async loadPage(url: string, { disableCache: boolean }): Promise<any> {}
+  async loadPage(url: string, { disableCache: boolean }): Promise<void> {}
   async get(url: string): Promise<void> {}
 
   async getValue(): Promise<any> {}