Their is another unused option :start_date in lib/run.rb:8 - currently not supported from the churn bin, but its used as default parameter, when a report is created. If the option is usable, than its just a line more with condition and command line string (`--start_date=@options[:start_date]`).

`system(@churn_command)` won't work, `system` returns only `true`, `false` or `nil` - I tried it already.

The `@opts`assignment:

```
def command_line_options
 opts = ["--yaml"]
 opts << "--minimum_churn_count=#{@options[:minimum_churn_count]}" if @options[:minimum_churn_count]

 opts.join(" ")
end

private

 def command_line_call 
  `churn #{command_line_options}`
 end`


`command_line_options` is public now and can be tested without using `churn.send(:command_line_options)`