If a unit test doesn't finish in 5 minutes, it's not a unit test.

If a unit test doesn't finish in 5 minutes, it's not a unit test.

These tests seem to often be outliers in execution time.  In faster
modern machines the slowness is not noticeable, but in slower machines
these are excruciatingly slow.

In slow machines these tests may grind for hours, but that is not
that useful information.  We know the machine is slow, already.

The uniprops.t could also use the watchdog, except that TestProp.pl
seems to be purposefully avoiding using test.pl.