parallel/unittest/wanted-results/sem01

### Test mutex. This should not mix output
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done
### Test default id = --id `tty` and --semaphorename
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done
### Test semaphore 2 jobs running simultaneously
job1
job2
job1
job2
done
### Test if parallel invoked as sem will run parallel --semaphore
job1
job2
job1
job2
done
### Test similar example as from man page - run 2 jobs simultaneously
Expect done: 1 2 5 3 4
Scheduling 5
Scheduling 1
starting 5
Scheduling 2
starting 1
done 1
Scheduling 3
starting 2
done 2
Scheduling 4
starting 3
done 5
starting 4
done 3
done 4
### Test --fg followed by --bg
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