Testing - connecting and getting data from web services

[Sidd (Sidd Tewari)]

Continuing the discussion from Using TDD concepts for an application whose sole purpose to consume and download data from another RESTful API:

@Sidd

I’m building a new Rails app to interact with a third party RESTful web services API. At this point its mostly making GET calls, parsing, and saving data to local db tables. I’m wondering what parts could/should be tested (and what parts, if any, could’ve been test driven development.)

What should and can be tested, or can be developed using TDD concept when building a pure RESTful API consumption Rails application?