Philip Withnall 8cff531520 tests: Isolate directory access for gdbus-connection-flush test
When multiple tests were run in parallel, this would race on its access
to `~/.dbus-keyrings` to authenticate with the D-Bus server, since the
keyring directory was not appropriately sandboxed to the unit test.

Use `G_TEST_OPTION_ISOLATE_DIRS` to automatically isolate each unit
test’s directory usage.

This should hopefully fix the failure seen in
https://gitlab.gnome.org/GNOME/glib/-/jobs/1849524, where the following
was in the log for a test executed in parallel:
```
GDBus-DBUS_COOKIE_SHA1: Deleted stale lock file '/home/user/.dbus-keyrings/org_gtk_gdbus_general.lock'
```

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
2022-03-12 00:03:05 +00:00
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