It hasn't no, but some evidence:
- "Finn uses the lightsaber for the first time."
- "Finn uses it well and impresses Maz."
- "Maz tells Leia the saber should be with Finn. Maz gives the lightsaber to Leia."
*"They approach a giant tunnel or exhaust port for the Starkiller base (on the way there they fight some Stormtroopers here and there and Finn uses the lightsaber instead of a blaster)".
*"Finn helps by using the Skywalker lightsaber."
*"The codes they hoped to use to shut down the shield defenses of the base have been changed. Han tells Finn he’s going to have to use his lightsaber. Finn doubts himself but Han believes in him and Finn uses the lightsaber and dismantles the shield’s power."
*"Finn chases Kylo into the forest. Their red and blue laser swords clash.
Finn holds his own against Kylo as he fights fiercely. However, Kylo disarms Finn, injuring him. Rey picks up the lightsaber and duels Kylo for some time".
I know he was an elite stormtrooper, but to be compeltely untrained in this and hold his own for some time against a Sith Lord, and possibly a Skywalker/Solo, is impressive and I'd be very surpsied if he wasn't a powerful force sensitive.