rails5-depot/test/models/product_test.rb

require 'test_helper'

class ProductTest < ActiveSupport::TestCase
  # Rails is already doing this! (convention over configuration!)
  fixtures :products
  # test "the truth" do
  #   assert true
  # end

  test "product attributes must not be empty" do
    product = Product.new
    assert product.invalid?
    assert product.errors[:title].any?
    assert product.errors[:description].any?
    assert product.errors[:image_url].any?
    assert product.errors[:price].any?
  end

  test "product price be positive" do
    product = Product.new(title: 'My Book Title',
                          description: 'My Description.',
                          image_url: 'image.jpg')

    product.price = -1
    assert product.invalid?
    assert_equal ['must be greater than or equal to 0.01'],
                  product.errors[:price]

    product.price = 0
    assert product.invalid?
    assert_equal ['must be greater than or equal to 0.01'],
                  product.errors[:price]

    product.price = 1
    assert product.valid?
  end

  def new_product(image_url)
    product = Product.new(title: 'My Book Title',
                          description: 'My Description.',
                          image_url: image_url,
                          price: 1)
  end

  test "image url" do
    ok = %w{ fred.jpg hans.png paul.Png peter.JPG
              http://a.b.c.d/images/foo.gif }
    bad =%w{ fred.doc hans.gif/more }

    ok.each { |name| assert new_product(name).valid? "#{name} shouldn't be invalid" }

    bad.each do |name|
      assert new_product(name).invalid? "#{name} shouldn't be valid"
    end
  end

  test "product is not valid without a unique title - i18n" do
    product = Product.new(title: products(:ruby).title,
                          description: 'Foo.',
                          price: 1,
                          image_url: "foo.jpg")
    assert product.invalid?
    assert_equal [I18n.translate('errors.messages.taken')],
                  product.errors[:title]
  end

  test "product is not valid without minimum 5 characters in title" do
    product = Product.new(title: 'Shrt',
                          description: 'A short work.',
                          price: 0.99,
                          image_url: 'short.jpg')
    assert product.invalid?
    assert_equal ['is too short (minimum is 5 characters)'],
                  product.errors[:title]
  end
end