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There's a race condition somewhere in GTestDBus that can result in the next test being started at a time when g_bus_get() would still return the connection that is in the process of closing. This can be reproduced reasonably reliably by running the gapplication test 10K times in a loop. Instead of relying on waiting for the weak reference to be released, we can force the issue by clearing it. Bug: https://bugzilla.gnome.org/show_bug.cgi?id=768996 Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=894677
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