Embedded system is a combination of both hardware and software, the testing and development of which calls also for other things than just software and the device itself. It is often necessary to measure the signals of the device, simulate the input signals or otherwise control the device from the outside during its testing. Without an appropriate testing environment, testing a device becomes slow, laborious and unreliable.
Software development relies on agile practices and methods, which avoid large debacles and promote teamwork. Testing is an inseparable part of the development process right from the definition phase. The tasks overlap and information moves smoothly within a modern design team. The test engineer is a team member and no longer considered a messenger of bad news.