## unit test
require 'test/test_helper'

class PageTest < ActiveSupport::TestCase
  def test_invalid_if_any_field_empty
    page = Page.new
    assert !page.valid?
    assert page.errors.invalid?(:title)
    assert page.errors.invalid?(:body)
  end
  def test_valid_fields
    page = pages(:valid_page) #arg is the name of the fixture
    assert page.valid?
  end
end

## fixture
valid_page:
  id: 1
  title: Welcome Page
  permalink: welcome-page
  body: Welcome to the welcome page.

invalid_page_short_title:
  id: 2
  title: a
  permalink: a
  body: The title is shorter than 3 characters

valid_with_auto_permalink:
  id: 3
  title: Another page, but without a permalink
  body: No permalink is given so it should be automatically generated