A gun writer described what he called a 'box' test. You shoot a group at a spot, adjust the scope up a few inches and aim at the same spot, adjust left or right and shoot at the same spot, adjust down and shoot, then adjust left or right and shoot.
If the box is tilted, the sight or scope is mounted crooked (presuming you aren't canting the rifle when you shoot. I tend to do that a little naturally, so all my scopes are mounted crooked to everyone else). You can measure group to group to see how accurate the scope tracks, and the last group should land in the first if everything is ticking okay.
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