Rails Active Record simple test

rails_test.rb

# run by `ruby rails_test.rb`
# credits to https://github.com/rails/rails/issues/13744#issuecomment-32670636
gem 'activerecord', '5.0.0.1'
require 'active_record'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:') # Create the test before, or use `create_database 'test'` in code
# For MariaDB you can try this:
# ActiveRecord::Base.establish_connection(adapter: 'mysql', user: 'root', database: 'test')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.string   "name"
  end
  add_index :posts, :name, :unique => true
end

class Post < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_persist_state_after_db_error
    post = Post.new
    post.name = "garga"
    post.save!
    post = Post.new
    post.name = "garga1"
    post.save!
    assert_equal true, post.changed.empty?

    post.name = "garga"
    puts "post #{post.id} changed: #{!post.changed.empty?}"
    assert_equal false, post.changed.empty?

    raised = false
    begin
      post.save
    rescue ActiveRecord::RecordNotUnique => e
      raised = true
    end

    puts post.id
    puts post.persisted?

    assert_equal true, raised
    assert_equal false, post.changed.empty?
  end
end