如何在RSpec中创建测试数据

Question

Hi i am working on rails app with ruby-2.5.0 and Rails 5. I have to test my forgot_password controller there is a method which validates if the email id is presnt in the database or not.

forgot_password_controller.rb
# frozen_string_literal: true

class ForgotPasswordController < ApplicationController

    def create
        user = User.find_by_email(forgot_password_params[:email])
        unless user.blank?
      render json: {}, status: 200
    else
      render json: {}, status: 404
    end
  rescue StandardError
    render json: {}, status: 500
  end

    private

  def forgot_password_params
    permitted = %i[email]
    params.require(:data)
          .require(:attributes)
          .permit(permitted)
          .transform_keys(&:underscore)
  end
end

I want to test my api. i have written unit testing as follows:-

forgot_password_controller_spec.rb
# frozen_string_literal: true

require 'rails_helper'

describe ForgotPasswordController do
  before do
    User.create!(email: 'xyz@gmail.com',
                 password: 'pass',
                 password_confirmation: 'pass')
  end

  describe 'POST create' do
    subject { post :create, params: params }

    context 'when email is found' do
      let(:params) do
        { data: { attributes: { email: 'xyz@gmail.com' } } }
      end

      it { is_expected.to have_http_status(200) }
    end

    context 'when email is not found' do
      let(:params) do
        { data: { attributes: { email: 'xyz2@gmail.com' } } }
      end

      it { is_expected.to have_http_status(404) }
    end

    context 'when wrong params passed' do
      let(:params) do
        { data: '' }
      end

      it { is_expected.to have_http_status(500) }
    end
  end
end

Now i want to create test data with 'let' like

let(:user) { instance_double('user') }
let(:save_result) { true }

How can i create user with let please help me. Thanks in advance.

Answer 1

I'd look into using FactoryBot aka FactoryGirl as it makes writing that stuff out easier. But for your case this should be what your looking for:

let(:user) { User.create!(email: 'xyz@gmail.com', password: 'pass', password_confirmation: 'pass') }

If you had FactoryBot, you could simplify that with:

let(:user) { create(:user) }

Or possibly for better performance, if you don't actually need a record created but simply built:

let(:user) { build_stubbed(:user) }