There is no single IoT, but rather many different kinds of IoT devices, environments and apps. This diversity affects the testing landscape, which will be more diverse than traditional testing due to factors like lack of constant connectivity, power issues, and limited computing power. To test for these variables, tools like Vaurien can simulate unreliable infrastructure, while Selenium provides a way to control networking variables. Real-device testing will still have its role but may not be as reliable as simulated device testing. As IoT becomes more mainstream, software specifically designed for IoT testing is expected to emerge, likely by 2020 when the number of IoT devices hits 50 billion.