Unit tests for the simplest Rails API ever example with RSpec

users_controller_spec.rb

require 'rails_helper'

RSpec.describe UsersController, type: :controller do
  describe 'index' do
    context 'without any user' do
      before { get :index }
      it { is_expected.to respond_with 200 }
      it 'should return an empty list' do
        expect(JSON.parse(response.body)).to eql([])
      end
    end
    context 'with users' do
      before do
        my_group = Group.create!(name: 'Kaamelott', status: 1)
        password = 'Arthur! Pas changer assiette pour fromage! @2005'

        attributes = {
          group: my_group,
          status: 1,
          password: password,
          password_confirmation: password
        }

        @user1 = User.create!(
          attributes.merge(
            first_name: 'Guillame',
            last_name: 'Briat',
            email: '[email protected]'
          )
        )
        @user2 = User.create!(
          attributes.merge(
            first_name: 'Alexandre',
            last_name: 'Astier',
            email: '[email protected]'
          )
        )

        get :index
      end
      it { is_expected.to respond_with 200 }
      it 'should return a list composed of users' do
        expect(JSON.parse(response.body)).to eql(
          [
            {
              'id' => @user1.id,
              'created_at' => @user1.created_at,
              'updated_at' => @user1.updated_at,
              'first_name' => 'Guillaume',
              'last_name' => 'Briat',
              'status' => 1,
              # ...
            }
          ]
        )
      end
    end
  end
end