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We introduce our tool-suite that facilitates automated testing of applications for wireless sensor networks (WSNs). WSNs are highly distributed systems and therefore require a testing infrastructure. We present a general-purpose testing framework which enables component, integration, and system testing. When using our testing framework, test cases have to be implemented by several modules. To coordinate the execution of these modules synchronization code must be written which is a complex and time consuming task. To bypass this task and thus make the test case implementation process more efficient, we introduce a model-driven approach that delegates this task to the code generator. Thereto, the test scenario is represented in a model and the code of the modules is generated. This model also eases the task of isolating faults in the code of the application being tested because the model can be refined to get insights on the application’s behavior to backtrack the cause of the failure reproduced by the test case.