The TDIS workshop aims to provide a forum for current work by researchers and practitioners in the different research areas and application domains connected to testing IoT systems. We welcome submissions that describe initial ideas and visions, just as much as reports on novel approaches, practical tools, and completed projects. In case that the workshop will have to take place virtually, we will make sure there will be ample opportunities for constructive feedback, lively discussions, and direct interactions.

Topics of interest include but are not limited to:
- physical and hybrid IoT testbeds
- simulation and emulation of IoT environments
- co-simulation within IoT domains
- model-based and model-supported approaches
- simulation-based integration testing
- testing and benchmarking on heterogeneous IoT devices
- testing and benchmarking of network technologies and protocols
- testing and benchmarking of real-time behavior
- testing and benchmarking of fault tolerance mechanisms (fault injection, chaos - engineering, etc.)
- dependability modeling and assessments (high availability, consistency, etc.)
- testing and modeling of resource usage and energy consumption
- resource management and scheduling in testbeds
- scalability and efficiency of test runs and testbeds
- testing frameworks for edge and fog computing
- testbed automation and orchestration
- distributed monitoring, tracing, and error detection
- usability of testbeds and testing frameworks
- representativeness, reproducibility, and repeatability of test results