State machine initial state broken after rails/rails@366e7e3

test_case.rb

# frozen_string_literal: true

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", github: "rails/rails", branch: "5-2-stable"
  gem "sqlite3"
  gem 'state_machines-activerecord'
end

require "active_record"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.string :status
    t.string :name
  end
end

class Post < ActiveRecord::Base
  state_machine :status, initial: :pending do
    event :something do
      transition :pending => :completed
    end
  end
end

class BugTest < Minitest::Test
  def test_initial_state
    post = Post.create_with(status: 'completed').find_or_create_by!(name: 'foo')

    assert_equal "completed", post.status
  end
end