```ruby
if ENV['SIMPLECOV']
  require 'simplecov'
  SimpleCov.start do
    add_filter '_spec.rb'
    add_filter 'spec_helper.rb'
  end
end

require 'rubella'
require 'rubella/storage'
require 'rubella/input/json'```

Add rubella/input/base to spec helper
user
```ruby
if ENV['SIMPLECOV']
  require 'simplecov'
  SimpleCov.start do
    add_filter '_spec.rb'
    add_filter 'spec_helper.rb'
  end
end

require 'rubella'
require 'rubella/storage'
require 'rubella/input/base'
require 'rubella/input/json'
```
assistant