RailsチュートリアルのテストをRSpecで実施【 Relationshipモデル 単体テスト編 3/3】

# spec/models/relationship_spec.rb
RSpec.describe Relationship, type: :model do

  let(:user) { create(:user) }             # => フォローしているユーザ
  let(:other_user) { create(:other_user) } # => フォローされているユーザ
  let(:active) { user.active_relationships.build(followed_id: other_user.id) }
  subject { active }

  # リレーションシップが有効であること
  it { should be_valid }

  # follow/followedメソッド
  describe "follower/followed methods"
    # followメソッドは、フォローしているユーザを返すこと
    it "follower method return following-user"
    # followerメソッドは、フォローされているユーザを返すこと
    it "followed method return followed-user"

  # validations
  describe "validations" do
    # 存在性 presence
    describe "presence" do
      it "follower_id should not be empty"
      it "followed_id should not be empty"
    end
  end
end

  （抜粋）
  $ rails console test --sandbox

  [1] pry(main)>
  [2] pry(main)> user = FactoryBot.create(:user)
   id: 5,
   name: "Example user",
   email: "user@example.com",
   created_at: Sun, 05 Aug 2018 09:00:59 UTC +00:00,
   updated_at: Sun, 05 Aug 2018 09:00:59 UTC +00:00,

   （省略）

  [3] pry(main)>
  [4] pry(main)> other_user = FactoryBot.create(:other_user)
   id: 6,
   name: "Lina Kuvalis",
   email: "shadtowne@torp.net",
   created_at: Sun, 05 Aug 2018 09:01:21 UTC +00:00,
   updated_at: Sun, 05 Aug 2018 09:01:21 UTC +00:00,

   （省略）

  [6] pry(main)> active = user.active_relationships.build(followed_id: other_user.id)
  => #<Relationship:0x007f871e4ab120 id: nil, follower_id: 5, followed_id: 6, created_at: nil, updated_at: nil>

  [8] pry(main)> active.follower
    User Load (1.6ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT ?  [["id", 5], ["LIMIT", 1]]
  => #<User:0x007f871d592f58
   id: 5,
   name: "Example user",
   email: "user@example.com",

   （省略）

  [9] pry(main)>
  [11] pry(main)>
  [12] pry(main)> active.followed
    User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT ?  [["id", 6], ["LIMIT", 1]]
  => #<User:0x007f871d3e30e0
   id: 6,
   name: "Lina Kuvalis",
   email: "shadtowne@torp.net",

   （省略）

# spec/models/relationship_spec.rb

require 'rails_helper'

RSpec.describe Relationship, type: :model do

  let(:user) { create(:user) }             # => フォローしているユーザ
  let(:other_user) { create(:other_user) } # => フォローされているユーザ
  let(:active) { user.active_relationships.build(followed_id: other_user.id) }
  subject { active }

  # リレーションシップが有効であること
  it { should be_valid }

  # follow/followedメソッド
  describe "follower/followed methods" do
    it { should respond_to(:follower) }
    it { should respond_to(:followed) }
    # followメソッドは、フォローしているユーザを返すこと
    it "follower method return following-user" do
      expect(active.follower). to eq user
    end
    # followerメソッドは、フォローされているユーザを返すこと
    it "followed method return followed-user" do
      expect(active.followed). to eq other_user
    end
    # or
    # its(:follower) { should eq user }
    # its(:followed) { should eq other_user }
  end

  # validations
  describe "validations" do
    # 存在性 presence
    describe "presence" do
      it { is_expected.to validate_presence_of :followed_id }
      it { is_expected.to validate_presence_of :follower_id }
    end
  end
end

$bin/rspec spec/models/relationship_spec.rb

Relationship
  should be valid
  follower/followed methods
    should respond to #follower
    should respond to #followed
    follower method return following-user
    followed method return followed-user
  validations
    presence
      should validate that :followed_id cannot be empty/falsy
      should validate that :follower_id cannot be empty/falsy

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