There are projects which provide daemons needing to be able to create,
modify and delete Unix users.  Or just switch user ids to interact with
the system e.g. a user space file server.  To be able to test that you
need the privilege to modify the passwd and groups file.  With
nss_wrapper it is possible to define your own passwd and groups file
which will be used by software to act correctly while under test.

If you have a client and server under test they normally use functions
to resolve network names to addresses (dns) or vice versa.  The
nss_wrappers allow you to create a hosts file to setup name resolution
for the addresses you use with socket_wrapper.

- Provides information for user and group accounts.
- Network name resolution using a hosts file.
- Loading and testing of NSS modules.

Homepage:
https://cwrap.org/nss_wrapper.html
