electron/spec/api-debugger-spec.ts

import { expect } from 'chai';
import * as http from 'node:http';
import * as path from 'node:path';
import { BrowserWindow } from 'electron/main';
import { closeAllWindows } from './lib/window-helpers';
import { emittedUntil } from './lib/events-helpers';
import { listen } from './lib/spec-helpers';
import { once } from 'node:events';

describe('debugger module', () => {
  const fixtures = path.resolve(__dirname, 'fixtures');
  let w: BrowserWindow;

  beforeEach(() => {
    w = new BrowserWindow({
      show: false,
      width: 400,
      height: 400
    });
  });

  afterEach(closeAllWindows);

  describe('debugger.attach', () => {
    it('succeeds when devtools is already open', async () => {
      await w.webContents.loadURL('about:blank');
      w.webContents.openDevTools();
      w.webContents.debugger.attach();
      expect(w.webContents.debugger.isAttached()).to.be.true();
    });

    it('fails when protocol version is not supported', () => {
      expect(() => w.webContents.debugger.attach('2.0')).to.throw();
      expect(w.webContents.debugger.isAttached()).to.be.false();
    });

    it('attaches when no protocol version is specified', () => {
      w.webContents.debugger.attach();
      expect(w.webContents.debugger.isAttached()).to.be.true();
    });
  });

  describe('debugger.detach', () => {
    it('fires detach event', async () => {
      const detach = once(w.webContents.debugger, 'detach');
      w.webContents.debugger.attach();
      w.webContents.debugger.detach();
      const [, reason] = await detach;
      expect(reason).to.equal('target closed');
      expect(w.webContents.debugger.isAttached()).to.be.false();
    });

    it('doesn\'t disconnect an active devtools session', async () => {
      w.webContents.loadURL('about:blank');
      const detach = once(w.webContents.debugger, 'detach');
      w.webContents.debugger.attach();
      w.webContents.openDevTools();
      w.webContents.once('devtools-opened', () => {
        w.webContents.debugger.detach();
      });
      await detach;
      expect(w.webContents.debugger.isAttached()).to.be.false();
      expect(w.devToolsWebContents.isDestroyed()).to.be.false();
    });
  });

  describe('debugger.sendCommand', () => {
    let server: http.Server;

    afterEach(() => {
      if (server != null) {
        server.close();
        server = null as any;
      }
    });

    it('returns response', async () => {
      w.webContents.loadURL('about:blank');
      w.webContents.debugger.attach();

      const params = { expression: '4+2' };
      const res = await w.webContents.debugger.sendCommand('Runtime.evaluate', params);

      expect(res.wasThrown).to.be.undefined();
      expect(res.result.value).to.equal(6);

      w.webContents.debugger.detach();
    });

    it('returns response when devtools is opened', async () => {
      w.webContents.loadURL('about:blank');
      w.webContents.debugger.attach();

      const opened = once(w.webContents, 'devtools-opened');
      w.webContents.openDevTools();
      await opened;

      const params = { expression: '4+2' };
      const res = await w.webContents.debugger.sendCommand('Runtime.evaluate', params);

      expect(res.wasThrown).to.be.undefined();
      expect(res.result.value).to.equal(6);

      w.webContents.debugger.detach();
    });

    it('fires message event', async () => {
      const url = process.platform !== 'win32'
        ? `file://${path.join(fixtures, 'pages', 'a.html')}`
        : `file:///${path.join(fixtures, 'pages', 'a.html').replaceAll('\\', '/')}`;
      w.webContents.loadURL(url);
      w.webContents.debugger.attach();
      const message = emittedUntil(w.webContents.debugger, 'message',
        (event: Electron.Event, method: string) => method === 'Console.messageAdded');
      w.webContents.debugger.sendCommand('Console.enable');
      const [,, params] = await message;
      w.webContents.debugger.detach();
      expect(params.message.level).to.equal('log');
      expect(params.message.url).to.equal(url);
      expect(params.message.text).to.equal('a');
    });

    it('returns error message when command fails', async () => {
      w.webContents.loadURL('about:blank');
      w.webContents.debugger.attach();

      const promise = w.webContents.debugger.sendCommand('Test');
      await expect(promise).to.be.eventually.rejectedWith(Error, "'Test' wasn't found");

      w.webContents.debugger.detach();
    });

    it('handles valid unicode characters in message', async () => {
      server = http.createServer((req, res) => {
        res.setHeader('Content-Type', 'text/plain; charset=utf-8');
        res.end('\u0024');
      });

      const { url } = await listen(server);
      w.loadURL(url);
      // If we do this synchronously, it's fast enough to attach and enable
      // network capture before the load. If we do it before the loadURL, for
      // some reason network capture doesn't get enabled soon enough and we get
      // an error when calling `Network.getResponseBody`.
      w.webContents.debugger.attach();
      w.webContents.debugger.sendCommand('Network.enable');
      const [,, { requestId }] = await emittedUntil(w.webContents.debugger, 'message', (_event: any, method: string, params: any) =>
        method === 'Network.responseReceived' && params.response.url.startsWith('http://127.0.0.1'));
      await emittedUntil(w.webContents.debugger, 'message', (_event: any, method: string, params: any) =>
        method === 'Network.loadingFinished' && params.requestId === requestId);
      const { body } = await w.webContents.debugger.sendCommand('Network.getResponseBody', { requestId });
      expect(body).to.equal('\u0024');
    });

    it('does not crash for invalid unicode characters in message', async () => {
      w.webContents.debugger.attach();

      const loadingFinished = new Promise<void>(resolve => {
        w.webContents.debugger.on('message', (event, method) => {
          // loadingFinished indicates that page has been loaded and it did not
          // crash because of invalid UTF-8 data
          if (method === 'Network.loadingFinished') {
            resolve();
          }
        });
      });

      server = http.createServer((req, res) => {
        res.setHeader('Content-Type', 'text/plain; charset=utf-8');
        res.end('\uFFFF');
      });

      const { url } = await listen(server);
      w.webContents.debugger.sendCommand('Network.enable');
      w.loadURL(url);

      await loadingFinished;
    });

    it('uses empty sessionId by default', async () => {
      w.webContents.loadURL('about:blank');
      w.webContents.debugger.attach();
      const onMessage = once(w.webContents.debugger, 'message');
      await w.webContents.debugger.sendCommand('Target.setDiscoverTargets', { discover: true });
      const [, method, params, sessionId] = await onMessage;
      expect(method).to.equal('Target.targetCreated');
      expect(params.targetInfo.targetId).to.not.be.empty();
      expect(sessionId).to.be.empty();
      w.webContents.debugger.detach();
    });

    it('creates unique session id for each target', (done) => {
      w.webContents.loadFile(path.join(__dirname, 'fixtures', 'sub-frames', 'debug-frames.html'));
      w.webContents.debugger.attach();
      let session: String;

      w.webContents.debugger.on('message', (event, ...args) => {
        const [method, params, sessionId] = args;
        if (method === 'Target.targetCreated') {
          w.webContents.debugger.sendCommand('Target.attachToTarget', { targetId: params.targetInfo.targetId, flatten: true }).then(result => {
            session = result.sessionId;
            w.webContents.debugger.sendCommand('Debugger.enable', {}, result.sessionId);
          });
        }
        if (method === 'Debugger.scriptParsed') {
          expect(sessionId).to.equal(session);
          w.webContents.debugger.detach();
          done();
        }
      });
      w.webContents.debugger.sendCommand('Target.setDiscoverTargets', { discover: true });
    });
  });
});