an act of trying one's luck (e.g. a draw, a small gamble or chance event); testing how lucky one is.
おみくじは軽い運試しだから、結果を深刻に受け止めないで。
A temple fortune slip is just a light try-your-luck—don't take the result too seriously.
旅行先で宝くじを買って、ちょっとした運試しをしてみた。
I bought a lottery ticket at the trip destination to try my luck a little.
転職は大きな決断だけど、思い切って運試しだと思って応募してみた。
Changing jobs is a big decision, but I thought I'd go for it and apply as a way of trying my luck.