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Yep, brass rod test is a decent one, but doesn't say a whole lot. It tells us that the heat treatment and geometry of that particular blade are within it's lower (rolling) and upper (chipping) limits. Nothing more, nothing less. When working with a new steel, I find it good to use the test, just to make sure that there aren't (shouldn't be anyway) rolling/chipping issues during use.
I know some think the brass rod test involves actually cutting the brass rod, which is not the case.
I just saw an Instagram post by knifemaker "hatcherknives" where he posted a good video of this test. Start at the heel, and flex the edge all the way to the tip.
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