How do I unit test a void function that inserts into the database and saves?

I have this function in my interface and it creates a new PlayersBadge entry in the db. I have to write unit tests for and I'm stuck.

public void Badge(int pID, int bID, int gID = 0)
        {
            var list = EliminationDbContext.PlayerBadges.Where(x=>x.Badge.BadgeID.Equals(bID) && x.Player.PlayerID.Equals(pID));
            //if player doesn't have Badge create new Badge
            if (list.Any() != true)
            {
                PlayerBadge b = new PlayerBadge { PlayerID = pID, BadgeID = bID, DateEarned = DateTime.Today, GameID = gID };
                EliminationDbContext.PlayerBadges.Add(b);

            EliminationDbContext.SaveChanges();
        }
    }