How to test posts in Rails / Capybara / Cucumber or Rspec

Question

I\'m using rspec, cucumber and capybara and I\'m looking for a way to test that a malicious user can\'t hack a form then post to an url he/she doesn\'t have permission to.

Answer 1

I think you can do this with rack-test https://github.com/brynary/rack-test

in your Gemfile:

gem 'rack-test'

in your env.rb file

module CapybaraApp
  def app; Capybara.app; end
end
World(CapybaraApp)
World(Rack::Test::Methods)

step defintions somewhere:

When /^I send a POST request to "([^"]*)"$/ do |path|
  post path
end

Most of what I learned came from here: http://www.anthonyeden.com/2010/11/testing-rest-apis-with-cucumber-and-rack-test

UPDATE: I think you can skip the changes to your env.rb file with newer versions of Rails and/or Cucumber (not sure which, I just don't do that part on my newer projects and it works fine)

Answer 2

Same as @Josh Crews I've largely based this off of: http://www.anthonyeden.com/2010/11/testing-rest-apis-with-cucumber-and-rack-test/#comment-159. But there are two notable exceptions: 1) I test the actual response body, 2) I demonstrate how to test a POST request. Here's an example using Rails 3.0.9:

Steps:

# features/step_definitions/api_step.feature
When /^I send a GET request to "([^\"]*)"$/ do |url|
  authorize(User.last.email, "cucumber")

  header 'Accept', 'application/json'
  header 'Content-Type', 'application/json'

  get url
end

When /^I send a POST request to "([^\"]*)" with:$/ do |url, body|
  authorize(User.last.email, "cucumber")

  header 'Accept', 'application/json'
  header 'Content-Type', 'application/json'

  post url, body
end

Then /^the JSON response should have (\d+) "([^\"]*)" elements$/ do |number_of_children, name|
  page = JSON.parse(last_response.body)
  page.map { |d| d[name] }.length.should == number_of_children.to_i
end

Then /^I should receive the following JSON response:$/ do |expected_json|
  expected_json = JSON.parse(expected_json)
  response_json = JSON.parse(last_response.body)

  response_json.should == expected_json
end

Then /^I should receive the following JSON object response:$/ do |expected_json|
  expected_json = JSON.parse(expected_json)
  response_json = JSON.parse(last_response.body)

  if expected_json['id'] == 'RESPONSE_ID'
    expected_json['id'] = response_json['id']
  end

  response_json.should == expected_json
end

Feature:

# features/api/some_feature.feature
Feature: Users API
  Background:
    Given the following users exist:
      | id | name |
      | 1  | Joe  |
      | 2  | Sue  |
      | 3  | Paul |

  Scenario: Index action
    When I send a GET request to "/users/"
    Then the JSON response should have 3 "user" elements
    And I should receive the following JSON response:
      """
      [
        {
          "id":1,
          "name":"Joe"
        },
        {
          "id":2,
          "name":"Sue"
        },
        {
          "id":3,
          "name":"Paul"
        }
      ]
      """

  Scenario: Create action
    When I send a POST request to "/users/" with:
      """
      {
        "name":"Polly"
      }
      """
    Then I should receive the following JSON object response:
      """
      {
        "id":"RESPONSE_ID",
        "name":"Polly"
      }
      """
    And I send a GET request to "/users/"
    And the JSON response should have 4 "user" elements