Based on code contributed by Manish Narang. This is not included in the
automated test suite, because it isn't reliable on heavily-loaded
automatic test infrastructure like Travis-CI.
Reviewed-by: Philip Withnall <withnall@endlessm.com>
[smcv: Add the test to the CMake build system too, as requested]
[smcv: Convert into a manual test]
Signed-off-by: Simon McVittie <smcv@collabora.com>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=102839
