As a reviewer, I like to test a mixture of light, medium, and darker shades across finishes to get a good, big picture overview of how the formula works out. Light shades often under-perform compared to deeper shades, just like matte finishes tend to wear super long compared to a glossier one, so only testing one type can be limiting!
My actual process is swatching through everything once, for photos, and I’ll make notes about anything that might standout (like a really stiff texture or terrible application) but tend to just work through them quickly for photos. After that, I test a variety of colors and finishes, and if a formula is on the drying side, I will alternate with glosses or something more hydrating. I apply and wear, checking every half hour to an hour (depending on the type of formula) to see how it is wearing. When it gets to the point where the product has started to wear away noticeably, I mark that point in time.