témoigner

2) De témoigner;

(2) Testify;

témoigner laïque

secular testifying

Témoigner de bon,

Bearing witness to good,

témoigner oralement

to give oral evidence

témoigner en justice

testify in court

habilité à témoigner

capable

témoigner son amitié

testify his friendship

Je peux en témoigner.

I was in Poland recently and can confirm this.