I’m encountering an issue with the Zombie.js headless browser not loading URLs. My setup includes Linux Ubuntu with a 3.13.0 kernel and Node.js version 0.10.38, along with Zombie version 3.1.0 and Jasmine-node version 1.14.3. Here’s a sample test script I wrote:
var HeadlessBrowser, check, currentBrowser, targetUrl, expectedTitle;
check = require('assert');
HeadlessBrowser = require('zombie');
var mainPage = "https://google.com";
var expectedPageTitle = "Google";
targetUrl = mainPage;
expectedTitle = expectedPageTitle;
currentBrowser = new HeadlessBrowser();
describe('homepage validation', function() {
describe('title verification', function() {
it('should display the correct title', function(complete) {
currentBrowser.visit(targetUrl).then(function() {
check.equal(currentBrowser.text('title'), expectedTitle);
complete();
}).catch(function(err) {
console.log('Encountered an error: ', err);
complete(err);
});
});
});
});
After running the command jasmine-node spec/, the outcome is:
F
Failures:
1) homepage validation title verification should display the correct title
Message:
TypeError: Object [object Promise] has no method 'catch'
Stacktrace:
TypeError: Object [object Promise] has no method 'catch'
at null.<anonymous> (path/to/sample_zombie_spec.js:21:12)
at null.<anonymous> (async-callback.js:45:37)
at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)
Finished in 0.12 seconds
1 test, 1 assertion, 1 failure, 0 skipped
I also tried running this test on another machine with a different setup, including Darwin 14.3.0 and io.js v1.8.1, but faced similar errors. My attempts at using different URLs, including local ones, have also failed. As someone who is relatively new to JavaScript and these libraries, I’m currently paralleling my learning from documentation and other resources. Any assistance in resolving this issue would be greatly appreciated, as I likely overlooked a small detail.
Sounds like the issue is with Node.js version 0.10.38, which lacks native Promise support. You can work around this without upgrading Node.js by replacing the .catch() method with a .then() method that handles errors. Check out this solution:
var HeadlessBrowser, check, currentBrowser;
check = require('assert');
HeadlessBrowser = require('zombie');
var mainPage = "https://google.com";
var expectedPageTitle = "Google";
currentBrowser = new HeadlessBrowser();
describe('homepage validation', function() {
describe('title verification', function() {
it('should display the correct title', function(complete) {
currentBrowser.visit(mainPage).then(function() {
check.equal(currentBrowser.text('title'), expectedPageTitle);
complete();
}, function(err) {
console.log('Encountered an error: ', err);
complete(err);
});
});
});
});
This uses a second callback in .then() for error handling, akin to the .catch() functionality. Let me know if this helps!
A common issue with the code setup you’ve provided is that it employs a callback-based handling style which might not be fully compatible with all the features in the older Node.js and ecmascript versions you are using. Specifically, the catch method for Promises is not available in your Node.js environment version (0.10.38), which predates the native implementation of Promises.
You can address this in a couple of ways:
-
Upgrade Node.js: It would be beneficial to upgrade to a more recent version of Node.js which has built-in support for Promises including .catch. As of now, LTS versions of Node.js are well supported and provide improvements in performance and security, along with modern JavaScript features.
-
Implement a suitable polyfill or use an alternative approach: You might consider leveraging callback-based patterns instead of using Promises. Here’s how you might update your script:
var HeadlessBrowser, check, currentBrowser;
check = require('assert');
HeadlessBrowser = require('zombie');
var mainPage = "https://google.com";
var expectedPageTitle = "Google";
currentBrowser = new HeadlessBrowser();
describe('homepage validation', function() {
describe('title verification', function() {
it('should display the correct title', function(complete) {
currentBrowser.visit(mainPage, function(err) {
if (err) {
console.log('Encountered an error: ', err);
return complete(err);
}
try {
check.equal(currentBrowser.text('title'), expectedPageTitle);
complete();
} catch (assertionError) {
complete(assertionError);
}
});
});
});
});
This modified script uses a callback style to handle errors and assertions, which should be compatible with your current environment. Testing in this manner could resolve compatibility issues and allow the proper evaluation of the page title. Updating or testing on a system with a newer runtime might further offer insight into whether this resolves the Zombie.js loading behavior.
Hello! From your description, it seems the issue lies with your Node.js version (0.10.38), which lacks support for native JavaScript Promises. This is why the .catch() method is unrecognized. An effective workaround, without changing Node.js, involves replacing Promises with callbacks. Here's how you can adapt your script:
var HeadlessBrowser, check, currentBrowser;
check = require('assert');
HeadlessBrowser = require('zombie');
var mainPage = "https://google.com";
var expectedPageTitle = "Google";
currentBrowser = new HeadlessBrowser();
describe('homepage validation', function() {
describe('title verification', function() {
// Use a callback-style visit
it('should display the correct title', function(complete) {
currentBrowser.visit(mainPage, function(err) {
if (err) {
console.log('Encountered an error: ', err);
return complete(err);
}
try {
check.equal(currentBrowser.text('title'), expectedPageTitle);
complete();
} catch (assertionError) {
complete(assertionError);
}
});
});
});
});
This script utilizes callback functions instead of Promises, which makes it compatible with older Node.js versions. It also handles errors within the callback context, allowing your test to proceed smoothly without errors from missing Promise methods.
If upgrading Node.js is an option, I recommend it for better support of modern JavaScript features and improved performance.