There are some XRF units that can measure the different
thickness of metal platting. I have not used one to verify platting
thickness of a questionable PCB, but watched the feature demoed during a
sales pitch. It was pretty accurate in determining the plating thickness
of the gold but became less accurate as you penetrated the different
platting layers. 
        I don't think a solder test will do you any good, the pad may
wet just fine but cause reliability issues in the field. What class
assembly is this? Is it a high runner that may require a large recall if
something were to go south? 
        I would have so sort of testing done just to make sure
everything is as it should be. 

Good Luck,

Ted T

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