libnss-wrapper - 1.1.16-1 main

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,
for example 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.