Everyday 1300 apps are being launched to google play store. So just with this fact you can imagine how tough competition is every body giving to each other. So with this speed the testing speed need to be boost up. But the fact is with the advancement in development, how and what kind of testing strategies should be adopted. Testing strategies like Automation testing, Testing with Emulators and testing with the majority devices being used in the market. But there are also several conditions where we need to test on real devices like if we have to test the battery usage of the app, storage usage, network usage.
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Automation Testing for mobile applications is very effective because it minimizes Human resources, allows you to quickly scale apps and also run tests for loger duration of time. I would reccomend you the platform QAppAssure by MOZARK. You can Access logs - automation, OS, TCP, Enable screenshots & recordings, and Use Appium, Calabash, Espresso, UIAutomator, XCUITest and Their APIs are extremely comprehensive.