The Internet of Things (IoT) is a network of physical objects, or things, with embedded electronics, software, sensors, and connectivity. The connection of all these things leverages value generation, by offering new services and strategic information. In order to make the Internet of Things possible, the integration of many technologies is necessary, such as machine-To-machine and cyber-physical systems. The process of testing IoT applications introduces new challenges because it does not only includes typical test strategies and methodologies. Testing an IoT system depends on its the specific configuration, and it also needs to consider the hardware platform and the network environment. Currently, industry and academy efforts are focusing on usability and connectivity tests, such as: simulating the environment where the device is to be used, and ensuring information is exchanged in a secure manner. In this paper, we use the current version of our IoT platform to perform stress testing of our IoT platform under different conditions. Our test methodology for IoT applications is also presented. Three different hardware platforms have been used for performing the stress testing of our platform.