Allow 'format' to be specified when calling pact-ruby-standalone

[joshhendo]

In my provider project, I'm interested in presenting the results in a different format (e.g. having multiple mocha tests for each thing tested, rather than a large single test).

Taking a look at how I could parse the output from verifyProvider, I noticed that the underlying binary (pact-ruby-standalone) allows a --format flag to be passed, with JSON available as one of the outputs.

I have quickly put together a proof of concept here: #86 . By not appending the stderr output to the string (due to it adding INFO lines), and by specifying the format to be json, I was able to parse the JSON response.

I'd be happy to work on implementing this feature fully beyond the proof of concept (e.g. agree on what the options should be called, adding in tests etc.)

[mboudreau]

Closing this as it's been pushed out with version 6.18.0.

[mboudreau]

@joshhendo I'm going to do another release (6.18.1) that instead of using "RspecJunitFormatter" for format, just uses "xml" instead, so the option is either "json" or "xml". I feel like the abstraction is needed and better reflects what the binary is actually doing. Hope that's alright.

New version going out now.