Regression test template for activerecord.gem with PostgreSQL. Borrowed from https://github.com/rails/rails/blob/master/guides/bug_report_templates/active_record_gem.rb

active_record_gem.rb

# Activate the gem you are reporting the issue against.
gem 'activerecord', '4.0.4.rc1'
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('postgres://username:password@hostname/dbname')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.string :tags, array: true, default: '{}'
  end
end

class Post < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_empty_array_member
    post = Post.create!
    post.tags = ['foo', 'bar', 'baz', '']
    post.save!

    post.reload

    assert_equal 4, post.tags.count
  end
end

Gemfile

source 'https://rubygems.org'

ruby '2.1.1'

gem 'activerecord', '4.0.4.rc1'
gem 'pg', '0.17.1'