Thanks to help from pabs, it seems the testsuite fails when network is not available.
I didn't catch this since I use sbuild. It is not immediately obvious to me why the testsuite requires networking, but I'll try debugging further. -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Louis-Philippe Véronneau ⢿⡄⠘⠷⠚⠋ po...@debian.org / veronneau.org ⠈⠳⣄
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