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I'm looking for a way to programmatically change navigator.userAgent on the fly. In my failed attempt to get an automated javascript unit tester, I gave up and attempted to begin using fireunit. Immediately, I've slammed into one of the walls of using an actual browser for javascript testing.
Specifically, I need to change navigator.userAgent to simulate a few hundred userAgent strings to ensure proper detection and coverage on a given function. navigator.userAgent is readonly, so I seem stuck! How can I mock navigator.userAgent? User Agent Switcher (plugin) can switch FF's useragent, but can I do it within javascript?
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Mock functions allow you to test the links between code by erasing the actual implementation of a function, capturing calls to the function (and the parameters passed in those calls), capturing instances of constructor functions when instantiated with new , and allowing test-time configuration of return values.
The userAgent property returns the user-agent header sent by the browser to the server. The userAgent property is read-only. The value returned, contains information about the browser name, version and platform.
Try:
navigator.__defineGetter__('userAgent', function(){ return 'foo' // customized user agent }); navigator.userAgent; // 'foo' Tried it in FF2 and FF3.
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