How have your marriage vows been tested?

I was listening to a song the other day and there are these lines that always capture me….

..Your love is devoted, like a ring of solid gold, like a vow that’s been tested, like a covenant of old..

ETA—> [Song: Ever Be by Kalley Hailigenthal]

I’m not married and I want to be. But one thing I’ve been noticing is the not so bright side of marriage, like walking through tough life stuff or seeing your partner in pain. Things I’ve not had to endure. Also, I tend to romanticize marriage so I’m curious to know from those who are married, how have your vows been tested? What fortified your marriage/bond to help you endure and come through it?