The number of electronic devices is increasing dramatically, even in automotive environments. Car and semiconductor manufacturers altogether developed the new communication protocol FlexRay to enable highly sophisticated applications like x-by-wire. Of course, great efforts are made to ensure error-free operation of these new hardware and software technologies. In this book the author explains the fundamentals of software testing, as well as the basics of the communication protocols CAN and FlexRay on a technical level. He outlines the main differences of these protocols and the reasons for the development of FlexRay. In the second half of the book, the author introduces the reader to a monitoring device for CAN and FlexRay networks which also includes additional features like data transmission and data logging. Also, two practical examples of testing this monitoring device are explained from scratch. This book is targeted at software developers who want to learn about software testing with the help of sample applications in a mixed environment.