I. Introduction
In the 21st century, the trend of society has been an increasing consumption of technology. We have become a digital society with the ubiquitous presence in developed countries of not just computers and large networks but also personal devices such as smartphones and tablets. Smartphones can do more than we think, and their power and connectivity have altered the behavior and lifestyle of people around the globe. Economists hold that there are three factors of production-land, labor, and capital-and some include “knowledge” as a fourth. In the 21st century age, there may be a fifth: digital technology. Applications that can run on multiple devices can enhance productivity and expand communication. For this to be possible, testing is key.