An interesting detail was presented to me by way of a thread at DigitalPoint Forums named Bolding doesn't work in the search results. The distinction here is that when Google finds a match between a keyword and the text in the URL, it will bold the URL in the SERPs. But when the URL is capitalized, the keyword will not match and will not be bolded in the SERPs.
As mentioned in the thread a search on allinurl:Test at Google will bring back results, some with bolded keywords in the URL. A picture will help. Does this have anything to do with rankings? I doubt it.