- added a test to the standalone-basics unit: the option subcommand queries the `home.username` value and ensures that something sane is returned.
details:
- the option subcommand was broken by upstream changes to the `nixos-option` command.
- hm had no tests for the option subcommand, so the problem was discovered by users.
- output from nixos-option probably starts with 'Value:\n "alice"', but we're only looking for 'alice' because the output format is not guaranteed.
This introduces some rudimentary integration tests using the NixOS
test framework. The intent is to better catch regressions when doing
more elaborate changes that may affect overall Home Manager behavior.
Note, the tests are currently not run automatically.
