I always tell my friends and anyone else looking for a LTR that one of the $hit tests we must give women is the ability for them to stick with us through thick and thin. I always tell my friends to not show up on dates with anything fancy(nice watch for example), nor take them anywhere nice, nor drive their nice cars to dates.
You could also pretend to get laid off, have someone pass away, etc to see how supportive they are, earlier in the relationship as to not waste time for these surprises later in life. It sucks but I guess it's better to know sooner than later.
Fortunately, I met my wife when I was unemployed and drove a Subaru so I knew if she stuck with me then, she would stick it out with me through other things.