```ruby
require 'simplecov'
SimpleCov.start

$:.unshift File.expand_path("../..", __FILE__)

require 'lib/shuttle'

def fixture_path(filename=nil)
  path = File.expand_path("../fixtures", __FILE__)
  filename.nil? ? path : File.join(path, filename)
end

def fixture(file)
  File.read(File.join(fixture_path, file))
end```

Add spec filter for coverage
user
```ruby
require 'simplecov'
SimpleCov.start do
  add_filter "/spec/"
end

$:.unshift File.expand_path("../..", __FILE__)

require 'lib/shuttle'

def fixture_path(filename=nil)
  path = File.expand_path("../fixtures", __FILE__)
  filename.nil? ? path : File.join(path, filename)
end

def fixture(file)
  File.read(File.join(fixture_path, file))
end```
assistant