HOWTO test teuthology tasks

The Ceph integration tests run by teuthology are described with YAML files in the ceph-qa-suite repository. The actual work is carried out on machines provisioned by teuthology via tasks. For instance, the workunit task runs a script found in the qa/workunits directory of the Ceph repository.
The script, although small, is complex enough to deserve testing. Creating unit tests would require a lot of mocking and it would not catch a typo in a shell command to be run on an actual machine. Another approach is to create light weight integration tests within the ceph-qa-suite repository itself. For instance tests/workunit is designed to maximize coverage of the script and run as quickly as possible.
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