The `#should` matcher is deprecated. Could you please switch to the `expect` syntax and remove the `do_match` method? Please see the [file content matcher spec](https://github.com/acrmp/chefspec/blob/master/spec/chefspec/matchers/file_content_spec.rb#L25) if you need an example. 

Please do not start `it` blocks with the word "should" either, it's [considered an anti-pattern](http://betterspecs.org/).