I want to test my failsafe without turning off the TX

I did a search but i still have questions
Futaba 8FG
i want to test the fail safe function, i already went to the calibration screen and programed my TX to trigger Fail-safe when i turn off the TX (and it works ) but im afraid to turn off the TX mid flight. I want to trigger the Fail-safe by re-assigning one of the modes to fail-safe is this the correct way to test or do you guys just turn off your TX the first time you try it ??
how do you guys first test your Fail-safe ??
 

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