Certain example embodiments relate to white-box testing techniques, e.g., for graphical user interfaces (GUIs). A test case to be run on the application includes interactions between the application and external components that were gathered as the application ran and received user input from a user until a desired test state was reached, and assertions to be made to the application once that state is reached. A test environment replaces a normal environment in which the application runs. An adapter executes interactions on the test environment's GUI dedicated thread(s). The application is fed with interactions, through the adapter, until the application reaches the desired state. Once the application reaches that state, the application is fed with assertions. Expected data associated with the assertions is compared with data actually being generated by the application. A determination is made regarding whether the test case resulted in success or failure.