test(extensions): add background page devtools test

spec-main/extensions-spec.ts

@@ -207,6 +207,17 @@ ifdescribe(process.electronBinding('features').isExtensionsEnabled())('chrome ex
       const receivedMessage = await w.webContents.executeJavaScript(`window.completionPromise`)
       expect(receivedMessage).to.deep.equal({ some: 'message' })
     })
+
+    it('can open devtools of background page', async () => {
+      const customSession = session.fromPartition(`persist:${require('uuid').v4()}`)
+      await customSession.loadExtension(path.join(fixtures, 'extensions', 'persistent-background-page'))
+      const w = new BrowserWindow({ show: false, webPreferences: { session: customSession } })
+      const promise = emittedOnce(app, 'web-contents-created')
+      await w.loadURL(`about:blank`)
+      const [, bgPageContents] = await promise
+      expect(bgPageContents.getType()).to.equal('backgroundPage')
+      bgPageContents.openDevTools()
+    })
   })
 
   describe('devtools extensions', () => {

spec-main/fixtures/extensions/persistent-background-page/background.js

@@ -0,0 +1 @@
+/* eslint-disable no-undef */

spec-main/fixtures/extensions/persistent-background-page/manifest.json

@@ -0,0 +1,9 @@
+{
+  "name": "persistent-background-page",
+  "version": "1.0",
+  "background": {
+    "scripts": ["background.js"],
+    "persistent": true
+  },
+  "manifest_version": 2
+}