fakeetc

require 'fakeetc'

FakeEtc.add_groups({
  'empty' => { gid: 42, mem: [] },
  'anonymous' => { gid: 43, mem: ['johndoe'] }
})
FakeEtc.add_users({
  'janedoe' => { uid: 10,
                 gid: 20,
                 gecos: 'Jane Doe',
                 dir: '/home/janedoe',
                 shell: '/bin/zsh' },
  'jackdoe' => { uid: 50,
                 gid: 60,
                 gecos: 'Jack Doe',
                 dir: '/home/jackdoe',
                 shell: '/bin/bash' },
})

anonymous = nil
jack = nil

FakeEtc do
  anonymous = Etc.getgrnam('anonymous')
  jack = Etc.getpwuid(50)
end

anonymous
# => #<struct Struct::Group
#      name="anonymous",
#      passwd="x",
#      gid=43,
#      mem=["johndoe"]>

jack
# => #<struct Struct::Passwd
#      name="jackdoe",
#      passwd="x",
#      uid=50,
#      gid=60,
#      gecos="Jack Doe",
#      dir="/home/jackdoe",
#      shell="/bin/bash",
#      change=nil,
#      uclass=nil,
#      expire=nil>