```ruby
require 'simplecov'
SimpleCov.start

$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)

require 'port_map'
```

Add tempfile require - need for older ruby versions
user
```ruby
require 'simplecov'
SimpleCov.start

$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)

require 'tempfile'
require 'port_map'
```
assistant