```ruby
require 'spec_helper'

# /proc/device-tree is only present if device-tree works
describe file('/proc/device-tree') do
  it { should be_symlink }
  it { should be_linked_to '/sys/firmware/devicetree/base' }
  it { should be_mode 777 }
  it { should be_owned_by 'root' }
end

describe file('/proc/device-tree/model') do
  it { should be_file }
  it { should be_mode 444 }
  it { should be_owned_by 'root' }
  its(:content) { should match /Raspberry Pi/ }
end

describe command('vcdbg log msg') do
  its(:stderr) { should match /Loading 'bcm.*\.dtb' to/ }
  its(:exit_status) { should eq 0 }
end
```

Fix integrations tests for device-tree
user
```ruby
require 'spec_helper'

# /proc/device-tree is only present if device-tree works
describe file('/proc/device-tree') do
  it { should be_symlink }
  it { should be_linked_to '/sys/firmware/devicetree/base' }
  it { should be_mode 777 }
  it { should be_owned_by 'root' }
end

describe file('/proc/device-tree/model') do
  it { should be_file }
  it { should be_mode 444 }
  it { should be_owned_by 'root' }
  its(:content) { should match /Raspberry Pi 3 Model B/ }
end
```
assistant