Embodiments include simulating a design under test on an electronic device. Aspects include running a test program on the design under test and capturing inputs into the design under test. Aspects also include storing the inputs into the design under test in a storage device. Responsive to determining that an event has occurred during execution of the test program, aspects include halting the test program on the design under test. Aspects further include enabling a user via a user interface to determine a cause of the event by performing a simulation of the design under test using the inputs stored in the storage device.