```ruby
begin
  require 'metric_fu'
  MetricFu::Configuration.run do |config|
    config.rcov[:test_files] = 'spec/**/*_spec.rb'
  end
rescue LoadError
end
```

Include spec/ when calling rcov.
user
```ruby
begin
  require 'metric_fu'
  MetricFu::Configuration.run do |config|
    config.rcov[:test_files] = 'spec/**/*_spec.rb'
    config.rcov[:rcov_opts] << '-Ispec'
  end
rescue LoadError
end
```
assistant