electron/spec/api-debugger-spec.js

const assert = require('assert');
const path = require('path');
const BrowserWindow = require('electron').remote.BrowserWindow;

describe('debugger module', function() {
  var fixtures = path.resolve(__dirname, 'fixtures');
  var w = null;

  beforeEach(function() {
    if (w != null) {
      w.destroy();
    }
    w = new BrowserWindow({
      show: false,
      width: 400,
      height: 400
    });
  });

  afterEach(function() {
    if (w != null) {
      w.destroy();
    }
    w = null;
  });

  describe('debugger.attach', function() {
    it('fails when devtools is already open', function(done) {
      w.webContents.on('did-finish-load', function() {
        w.webContents.openDevTools();
        try {
          w.webContents.debugger.attach();
        } catch(err) {
          assert(w.webContents.debugger.isAttached());
          done();
        }
      });
      w.webContents.loadURL('file://' + path.join(fixtures, 'pages', 'a.html'));
    });

    it('fails when protocol version is not supported', function(done) {
      try {
        w.webContents.debugger.attach("2.0");
      } catch(err) {
        assert(!w.webContents.debugger.isAttached());
        done();
      }
    });

    it('attaches when no protocol version is specified', function(done) {
      try {
        w.webContents.debugger.attach();
      } catch(err) {
        done('unexpected error : ' + err);
      }
      assert(w.webContents.debugger.isAttached());
      done();
    });
  });

  describe('debugger.detach', function() {
    it('fires detach event', function(done) {
      w.webContents.debugger.on('detach', function(e, reason) {
        assert.equal(reason, 'target closed');
        assert(!w.webContents.debugger.isAttached());
        done();
      });
      try {
        w.webContents.debugger.attach();
      } catch(err) {
        done('unexpected error : ' + err);
      }
      w.webContents.debugger.detach();
    });
  });

  describe('debugger.sendCommand', function() {
    it('retuns response', function(done) {
      w.webContents.loadURL('about:blank');
      try {
        w.webContents.debugger.attach();
      } catch(err) {
        done('unexpected error : ' + err);
      }
      var callback = function(err, res) {
        assert(!res.wasThrown);
        assert.equal(res.result.value, 6);
        w.webContents.debugger.detach();
        done();
      };
      const params = {
        "expression": "4+2",
      };
      w.webContents.debugger.sendCommand("Runtime.evaluate", params, callback);
    });

    it('fires message event', function(done) {
      var url = 'file://' + path.join(fixtures, 'pages', 'a.html');
      w.webContents.loadURL(url);
      try {
        w.webContents.debugger.attach();
      } catch(err) {
        done('unexpected error : ' + err);
      }
      w.webContents.debugger.on('message', function(e, method, params) {
        if(method == "Console.messageAdded") {
          assert.equal(params.message.type, 'log');
          assert.equal(params.message.url, url);
          assert.equal(params.message.text, 'a');
          w.webContents.debugger.detach();
          done();
        }
      });
      w.webContents.debugger.sendCommand("Console.enable");
    });

    it('returns error message when command fails', function(done) {
      w.webContents.loadURL('about:blank');
      try {
        w.webContents.debugger.attach();
      } catch(err) {
        done('unexpected error : ' + err);
      }
      w.webContents.debugger.sendCommand("Test", function(err) {
        assert.equal(err.message, '\'Test\' wasn\'t found');
        w.webContents.debugger.detach();
        done();
      });
    });
  });
});