The docker VM the suite runs in steps its wall clock back now and then (measured: 2 steps in 20 s, up to 0.5 s), so rows a test made one after another could read out of order (a files list sorted newest first, a scheduler's last runs). Every app module that took datetime from the datetime module reads a clock that never repeats or goes back; the scheduler test's own fixture for this goes.
peter
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