The very first thing to do when I got my new smartphone – test all hardware functions. Same apply to Xiaomi Redmi 2 that I bought from Mi Malaysia online store. Of course, I cannot run all the tests on the spot like buy it at physical mobile phone store. But it should help for those who do. The test tool is actually Xiaomi engineering test suite in their factory. They will run all these tests and make sure that Xiaomi devices passed all tests before ship to customer. But no harm to run them again by yourself if you wish too.