```ruby
control "open-development-environment-devbox-script-networking" do
  title "open-development-environment-devbox-script-networking control"

  describe file("/etc/network/interfaces") do
    it { should exist }
    it { should be_owned_by 'root' }
    it { should be_grouped_into 'root' }
    it { should be_readable.by_user('root') }
    its('mode') { should cmp '0644' }
    its('content') { should match('pre-up sleep 2') }
  end

end
```

Update test for networking script
user
```ruby
control "open-development-environment-devbox-script-networking" do
  title "open-development-environment-devbox-script-networking control"

  describe file("/etc/network/interfaces") do
    it { should exist }
    it { should be_owned_by 'root' }
    it { should be_grouped_into 'root' }
    it { should be_readable.by_user('root') }
    its('mode') { should cmp '0644' }
    its('content') { should match('pre-up sleep 2') }
  end

  describe file("/etc/default/grub") do
    it { should exist }
    it { should be_owned_by 'root' }
    it { should be_grouped_into 'root' }
    it { should be_readable.by_user('root') }
    its('mode') { should cmp '0644' }
    its('content') { should match('GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0') }
  end

  describe file("/etc/netplan/01-netcfg.yaml") do
    it { should exist }
    it { should be_owned_by 'root' }
    it { should be_grouped_into 'root' }
    it { should be_readable.by_user('root') }
    its('mode') { should cmp '0644' }
    its('content') { should match('eth0') }
  end

end
```
assistant