The phrase "ultimate test" means the most challenging or difficult task someone can face. It is like the biggest challenge that pushes a person to their limits. Full definition
Mario Party 2, the true pioneer of the party game genre and ultimate test of friendships, finally RSVPs to Wii U Virtual Consoles — just in time for the holidays! (nintendowire.com)
You can check out video and images of each car individually using the navigation panel on the right - and you can read the full story of the year's ultimate test in evo issue 164, on sale now! (evo.co.uk)
In a bid to attract Apple's users to the latest lineup of Galaxy smartphones, the South Korean competitor will now let iPhone users take one of three new models for the «ultimate test drive» for a full month. (9to5google.com)