1. A non-transitory computer readable storage medium storing instructions, the instructions when executed by one or more processors cause the one or more processors to: receive, from an emulator, a plurality of interface signals, generated by tracing interfaces during a first emulation of a design under test (DUT); after the first emulation of the DUT, transmit to the emulator instructions to run a second emulation of at least a portion of the DUT and one or more interface signals from the plurality of interface signals; and receive, from the emulator, information generated during the second emulation based on the one or more interface signals from the plurality of interface signals to determine that the portion of the DUT emulated during the second emulation performs as expected.