Embodiments disclosed herein provide systems, methods, and computer-readable media to facilitate testing user-selectable functions on a user interface of a computing device, wherein a piezoelectric grid comprising piezoelectric material that deforms upon application of electricity is installed onto a surface of the user interface of the computing device. In a particular embodiment, a method provides generating a control mapping of areas of the piezoelectric grid to locations on the user interface of the computing device. The method further provides receiving test instructions comprising actuation information for a targeted portion of the user interface of the computing device. The method further provides processing the test instructions and the control mapping to determine control signals for the piezoelectric grid to implement the test instructions, and transmitting the control signals to the piezoelectric grid to actuate the targeted portion of the user interface of the computing device.