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RSpecとCucumberでJSONデータをテストする

collectiveidea/json_spec · GitHub を利用します

Rspecの場合の使用例

describe User do
  let(:user){ User.create!(first_name: "Steve", last_name: "Richert") }

  context "#to_json" do
    it "includes names" do
      names = %({"first_name":"Steve","last_name":"Richert"})
      user.to_json.should be_json_eql(names).excluding("friends")
    end

    it "includes the ID" do
      user.to_json.should have_json_path("id")
      user.to_json.should have_json_type(Integer).at_path("id")
    end

    it "includes friends" do
      user.to_json.should have_json_size(0).at_path("friends")

      friend = User.create!(first_name: "Catie", last_name: "Richert")
      user.friends << friend

      user.to_json.should have_json_size(1).at_path("friends")
      user.to_json.should include_json(friend.to_json)
    end
  end
end

Cucumberの場合の使用例

Feature: User API
  Background:
    Given the following users exist:
      | id | first_name | last_name |
      | 1  | Steve      | Richert   |
      | 2  | Catie      | Richert   |
    And "Steve Richert" is friends with "Catie Richert"

  Scenario: Index action
    When I visit "/users.json"
    Then the JSON response should have 2 users
    And the JSON response at "0/id" should be 1
    And the JSON response at "1/id" should be 2

  Scenario: Show action
    When I visit "/users/1.json"
    Then the JSON response at "first_name" should be "Steve"
    And the JSON response at "last_name" should be "Richert"
    And the JSON response should have "created_at"
    And the JSON response at "created_at" should be a string
    And the JSON response at "friends" should be:
      """
      [
        {
          "id": 2,
          "first_name": "Catie",
          "last_name": "Richert"
        }
      ]
      """

JSONデータをテストしたい場合は、ぜひ活用したいですね。