- 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.
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