Abstract: The present disclosure provides methods for testing a software application using the natural input flow of the application. In one respect, a method includes observing the software application under test to determine a current, active input site of the application. The method generates a stimulus for the current, active input site based on the current execution state of the application and applies the stimulus to the current, active input site. The response of the stimulus may be evaluated. In one respect, the response may be evaluated prior to and after the stimulus is applied.