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Sauce Labs offers an API for running frontend JavaScript unit tests, so you can run tests on any combination of browsers and platforms. Not to be confused with functional tests, JavaScript unit tests are triggered by visiting a test page hosted by your servers, as with this example page. By visiting a test page with every browser provided by Sauce Labs, the results can be collated and you can quickly pin-point browser compatibility issues in your application. For general information about JavaScript unit testing, check out online guides such as this one from Smashing Magazine that provides a brief introduction to JavaScript unit testing.

To run your unit tests using Sauce Labs, send the URL of your test page, along with the list of browsers that should run it, through a single call to the JavaScript Unit Test API. After the test completes, another API call will produce the test results.

Sauce Labs visits the test page you specified and parses the test results by accessing a global JavaScript variable on the page. If your test page is on a local network, you can use Sauce Connect Proxy to create a secure tunnel from your system to the Sauce Labs cloud.The results are displayed on your Sauce Labs dashboard, in addition to being accessible through the  API.

Sauce Labs supports unit tests written using the Mocha, Jasmine, Qunit, and YUI test frameworks. We also support a "custom" framework that allows your to provide any sort of test results to Sauce Labs. Topics in the section Getting Started with JavaScript Unit Testing Example contain more information about how to set up your JavaScript unit test frameworks to work with Sauce.

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