What do you include in a fountain-pen paper test?

[inkandmoss]

GSM is easy to compare, but it doesn't tell me how a particular ink will behave. I'd use the same nib and ink on each sheet, write a few lines, add a swab and note feathering, show-through and drying time. Paper weight still tells you something about bulk and feel, but I wouldn't use it as a proxy for performance. What do you include in a paper test?