[RAILS] Efficient test code

Introduction

When creating the original app, I tested it using FactoryBot and Faker, so I'll post it so I don't forget it. ** FactoryBot: ** Gem that sets the value specified for each class instance in advance ** Faker: ** Gem that generates random values ​​such as email address, personal name, password, etc. ** As a premise, it is assumed that the test file user_spec.rb has already been generated. ** **

1. Introduction and setup of gem

1. Describe the FactoryBot and Faker Gem in group: development,: test do of Gemfile, and bundle install.

Gemfile

group :development, :test do
#Omission
  gem 'factory_bot_rails'
  gem 'faker'
end

2. Described in the FactoryBot file (②)

Write code using ** FactoryBot ** and ** Faker ** in the file created in 1. Faker's official GitHub https://github.com/faker-ruby/faker

FactoryBot file (②)

FactoryBot.define do
  factory :user do
    name        {Faker::Name.name}
    email       {Faker::Internet.free_email}
    password    {Faker::Internet.password(min_length: 8)}
    birthday    { '2000-01-01' }
　  #Omission
  end
end

3. Writing test code

Write FactoryBot.build (: user) to create an instance of User. Also, use ** before ** to create an instance before executing each test code.

user_spec.rb

require 'rails_helper'
RSpec.describe User, type: :model do
  before do
    @user = FactoryBot.build(:user)
  end

  describe 'New user registration' do
    it "Cannot register if nickname is empty" do
      @user.name = ""
      @user.valid?
      expect(@user.errors.full_messages).to include "Name can't be blank"
    end
    it "Cannot register if email is empty" do
      @user.email = ""
      @user.valid?
      expect(@user.errors.full_messages).to include "Email can't be blank"
    end
    #Omission
  end
end

Finally

It was something I learned once, but I remember it so much that I'm glad I was able to review it!