Issues stemming from cross-domain AJAX have resulted in errors with Karma and Jasmine

I've been working on configuring tests that utilize Jasmine and Karma to test my JavaScript code. Karma operates in Node.js and initiates a Chrome browser for testing purposes.

Unfortunately, I keep encountering an error message that reads "Chrome 28.0 (Windows) ERROR Script error. at :0" After investigating further, I discovered that certain objects created within my code trigger cross-domain AJAX calls which cause my Karma tests to crash.

Although the success of these AJAX calls is not crucial for the overall success of my tests, I would prefer if they did not lead to crashes in Karma.

I am exploring various solutions for this issue. Is it possible to adjust settings in Karma/Chrome to prevent the AJAX calls from failing catastrophically? Can I potentially override XMLHttpRequest to either block the problematic requests or prevent any requests altogether?

Additional Notes: The test does not fail when viewed in the debug window, despite still making cross-domain AJAX requests.

While I have implemented a testing library that overrides jQuery's AJAX functionality, another library in use continues to make its own AJAX requests.

javascriptajaxxssjasminekarma-runner

Answer №1

I encountered a CORS and AJAX issue, but with the help of jhamm's suggestion, I managed to resolve it. However, I ran into an error message stating "ERROR [launcher]: Cannot start chrome_without_security Can not find the binary chrome_without_security".

Since my problem was related to CORS, I discovered from this source that I needed to include the new browser type in the browsers list on karma.conf.js.

This is how I added it:

browsers: ['Chrome_without_security'],
customLaunchers:{
    Chrome_without_security:{
        base: 'Chrome',
        flags: ['--disable-web-security']
    }
}

After making this adjustment, as I only have one browser configured, I no longer need to specify

karma start --browsers Chrome_without_security

Now, I simply input

karma start

This will launch HeadlessChrome without security settings, resolving any CORS-related issues.

Answer №2

If you suspect a CORS issue, one solution is to turn off cross-domain restrictions by launching karma in a specific way:

karma start --browsers chrome_without_security

Chrome allows you to disable web security when starting up

open -a Google\ Chrome --args --disable-web-security

The team behind Karma has cleverly utilized this feature to address CORS issues.

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