Why does my Cucumber scenario that uses json_spec fail, and where is last_json defined?

Question

It is a very newbie question: I am developing a REST API using Rails and I'd like to use json_spec to handle JSON in RSpec and Cucumber. I created my feature test (from here):

  Feature: User API
  Scenario: User list
  Given I post to "/users.json" with:
    """
    {
      "first_name": "Steve",
      "last_name": "Richert"
    }
    """
  And I keep the JSON response at "id" as "USER_ID"
  When I get "/users.json"
  Then the JSON response should have 1 user
  And the JSON response at "0" should be:
    """
    {
      "id": %{USER_ID},
      "first_name": "Steve",
      "last_name": "Richert"
    }
    """

But I got this error:

Given(/^I post to "(.*?)" with:$/) do |arg1, string|
  pending # express the regexp above with the code you wish you had
end

When(/^I get "(.*?)"$/) do |arg1|
  pending # express the regexp above with the code you wish you had
end

I think methods get and post are provided by capybara, but I cannot make the system recognize them.

I also read that I’ll need to define a last_json method but I don't know where I should add it.

Thanks!

score 1 · Accepted Answer · edited May 23 '17 at 11:51

As the blog post you cited says, you need to write the "I post" and "I get" steps.

The get and post methods available in Cucumber steps are provided by rack-test, which Capybara depends on. Capybara is not designed to POST programmatically, so I would write those steps using the rack-test methods:

When /^I get "(.*?)"$/ do |path|
  get path
end

Given /^I post to "(.*?)" with:$/ do |path, body|
  post path, body
end

Define last_json in env.rb, or in another .rb file in features/support. If you use rack-test, last_json will need to use rack-test too:

def last_json
  last_response.body`enter code here`
end

Why does my Cucumber scenario that uses json_spec fail, and where is last_json defined?

1 Answers1