6.1.1 -> 6.2.4

app/models/user.rb

+class User < ActiveRecord::Base
+  validates :name, presence: true, length: { maximum: 50 }
+  VALID_EMAIL_REGEX = /[\w+\-.]+@[a-z\d*\-.]+\.[a-z]+/i
+  validates :email, presence: true, format: { with: VALID_EMAIL_REGEX }
+end

app/views/users/new.html.erb

-<% provide(:title, 'Sign up') %>
-<h1>Sign up</h1>
-<p>Find me in app/views/users/new.html.erb</p>
\ No newline at end of file
+<h1>Users#new</h1>
+<p>Find me in app/views/users/new.html.erb</p>

config/routes.rb

 Rails.application.routes.draw do
+  get 'users/new'
+
   root to: 'static_pages#home'
   get '/home', to: 'static_pages#home'
   get '/help', to: 'static_pages#help'

db/migrate/20200626094341_create_users.rb

+class CreateUsers < ActiveRecord::Migration
+  def change
+    create_table :users do |t|
+      t.string :name
+      t.string :email
+
+      t.timestamps null: false
+    end
+  end
+end

db/schema.rb

+# encoding: UTF-8
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20200626094341) do
+
+  create_table "users", force: :cascade do |t|
+    t.string   "name"
+    t.string   "email"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+end

spec/models/user_spec.rb

+require 'spec_helper'
+
+describe User do
+  before { @user = User.new(name: "Example User", email: "user@example.com") }
+  
+  subject { @user }
+
+  it { should respond_to(:name) }
+  it { should respond_to(:email) }
+
+  it { should be_valid }
+
+  describe "when name is not present" do
+    before { @user.name = " " }
+    it { should_not be_valid }
+  end
+
+  describe "when email is not present" do
+    before { @user.email = " " }
+    it { should_not be_valid }
+  end
+
+  describe "when name is so long" do
+    before { @user.name = "a" * 51 }
+    it { should_not be_valid }
+  end
+
+  describe "when email format is invalid" do
+    it "should be invalid" do
+      addresses = %w[user@foo,com user_at_foo.org example.user@foo. foo@bar_baz.com foo@bar+baz.com]
+      addresses.each do |invalid_address|
+        @user.email = invalid_address
+        expect(@user).not_to be_valid
+      end
+    end
+  end
+
+  describe "when email format is valid" do
+    it "should be valid" do
+      addresses = %w[user@foo.COM A_US-ER@f.b.org frst.lst@foo.jp a+b@baz.cn]
+      addresses.each do |valid_address|
+        @user.email = valid_address
+        expect(@user).to be_valid
+      end
+    end
+  end
+end