My understanding of international trade requirements is that
testing cannot be used as a trade barrier, as a means of
impeding the import/export of honey.

If there are legitimate sanitary/phytosanitary reasons, testing
can of course be imposed.  Even then, however, it has to be done
in a 'fair' way - you can't ask for the foreign honey to be
tested for some pest/disease that your country already has
(unless there is a formal programme attempting to eliminate it,
etc), and you can't ask for the imported honey to tested to a
greater degree than you are required to test your local honey.
That is, you couldn't test (and presumably reject) foreign honey
for having, say, AFB spores if there is no programme to
similarly test and restrict local honey.

Nick Wallingford
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http://www.beekeeping.co.nz