There is often confusion on the topics of Comfort tests and fitness test... aka shit tests. The most common way I see guys try to break it down to the newcomer is to simply say "comfort tests usually begin with her saying "I" and shit tests usually start with her starting with "you." For example: She may say "I feel like I'm sad lately." The "I" beginning signals that she is talking about her feelings and she is in need of comfort. How and when one goes about giving comfort is based on many different factors, such as the wife's personality, the husband's personality, the severity of the situation, the overall relationship... among many other factors.
Dominance/Fitness Tests–As Jordan Peterson outlines in this video (https://www.youtube.com/watch?v=rqLtEBVkZpA), men test ideas and women test men. Women test men to see if they truly have the behavioural traits that indicate they can move up dominance hierarchies. Mating with those types of men ensures their offspring will add value to the tribe and live long enough to have children of their own. If you pass these tests you will enjoy a pleasant demeanor and lots of sex, if you fail these tests you will suffer through god only knows what.
Now remember, women test men to find out which men have the right 'potential'. They aren't necessarily attracted to men at the top of dominance hierarchies, they're attracted to men who have behavioural traits that indicate they can reach the top of dominance hierarchies. From an evolutionary perspective, you're much better off ensuring your offspring will have the potential to reach the top of a dominance hierarchy rather than looking for guys who are already at the top. This is why many men who are rich CEOs have old, ugly wives who treat them like garbage and drug dealers have hot as fuck women chasing them around.