I've been able to reproduce this bug building in a networkless schroot with sbuild.
With a network access, the testsuite does not fail. I'll try to debug further and upload a patch. Thanks, -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Louis-Philippe Véronneau ⢿⡄⠘⠷⠚⠋ po...@debian.org / veronneau.org ⠈⠳⣄
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