Testing the Xamarin Apps with free Testing framework
There are loads of free testing frameworks - UITest, Appium. These frameworks are free, you just need devices or simulators to run them on.
If you want to run on cloud-hosted devices, then that's where it gets expensive...
Are you talking about Unit Tests or UI Tests? If Unit Tests, then NUnit is free and it works.
For UITests, I'm not so sure about the free part. App Center has, of course, UITest - but it's not free. Then again, it's not very expensive if your volumes are low - $99 per month.
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