# product_test.rb

require 'test_helper'

class ProductTest < ActiveSupport::TestCase
  test "uniqueness of description" do
    @product1 = Product.new(:description => "teste áéíóú")
    @product2 = Product.new(:description => "teste áéíóú")

    assert @product1.save
    assert !@product2.valid?

    assert_match /has already been taken/, @product2.errors.on(:description)
  end
end

# product.rb

class Product < ActiveRecord::Base
  validates_uniqueness_of :description
end

# database.yml

test:
  adapter: mysql
  encoding: utf8
  database: blog_test
  username: root
  password: