Develop the model in a software package in MATLAB/SIMULINK etc. Connect R-L load at the load side. Remember the output voltage will be negative as give by the equations. Switching pulses can be generated by pulse generator.
Simply, the Buck-Boost converter is a combined of Buck converter in addition to boost converter. So, if you know how to analyze each one separately, I think you can do same for the buck-boost converter.
Anyway, I attached a video to help you to understand and analyze the buck-boost converter.