The test binary has two modes: in the default argument-less mode, it just checks that "root" can be resolved. When invoked manually, a root prefix and user/group names can be specified.
System and Service Manager
Details
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Assorted, older, general information about systemd can be found in the systemd Wiki.
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Please see the Hacking guide for information on how to hack on systemd and test your modifications.
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Stable branches with backported patches are available in the stable repo.