Hmm. A rationale based an assumption: that swarming/brood break is the bees' (this bee's?) primary mite management tool... ?
"While it is clear that FKB hygiene confers some ability to remove Varroa, the response toward mites can be somewhat inconsistent (Spivak 1996; Spivak and Gilliam 1998b) and apparently stimulus-dependent (more hygiene against two versus one mite; Boecking and Drescher 1992). Screening for the removal of FKB as a means to select for resistance to V. destructor has been recommended based on prior observations that the hygienic responses toward FKB and V. destructor are somewhat related (Boecking and Drescher 1992; Spivak 1996). Our results using a variety of bee types having different selection histories do not support this recommendation; many colonies that had good hygiene against FKB had poor hygiene against V. destructor. A simple, effective way to select for strong VSH based resistance remains elusive." 
I'm thinking that while an 'easy' test is elusive, feral/wild survival is a probable indicator, and broad thriving without treatments (of any sort) a better one.
Worth noting some key results here (my emboldening):
"Two of five variables related to V. destructor infestation in resident brood combs varied according to the type of bee (Table II and Figure 3). The
percentage of mite-infested brood cells ranged from 1.3%in colonies of VSH bees to 17.7%in colonies of control bees (Figure 3a). Infestation in FKB hygienic colonies was statistically similar to those in controls and F1 VSH, and F1 VSH were similar to FKB hygienic and VSH. The percentage of recapped cells in resident brood was greater in VSH colonies (63 %) than in colonies of the other three bee types (mean, 42 %; Figure 3e). There were no differences between bee types for the percentage of infertile foundress mites (mean, 19 %; Figure 3b), the percentage of dead foundress mites (mean, 4 %; Figure 3c), or mite fecundity (mean, 3.1offspring per foundress mite; Figure 3d)."
Of course this is only one study. But I like that 1.3%/17.7% comparison! Is anyone here versed in spotting recapping?
There's also pulling off of legs, grooming, ability to withstand associated viruses - we shouldn't put too much weight on just one trait. Again, thriving without help (as measured by fair-comparison weight gain) seeems to me to be the best all-round measure.
Extracts from The Discussion; Varying congruence of hygienic responses to Varroa
destructor and freeze-killed brood among different types
of honeybees; Robert G. DANKA, Jeffrey W. HARRIS, José D. VILLA, Garrett E. DODDS
Apidologie Original article * INRA, DIB and Springer-Verlag France, 2013