Add more QDateTime test-cases close to the epoch

The prior tst_QDateTime::setMSecsSinceEpoch(-1) testcase was the last
millisecond of 1969; which (deep in the relevant function) actually
uses time_t 0 (with the -1 ms offset taken aside to be put back
later); so add the matching -1 second test. At the same time, add +1ms
and +1s checks for symmetry.

Change-Id: Ib487305f6ad81b55563ea59926cae13fb1fde592
Reviewed-by: Andreas Buhr <andreas.buhr@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions