Test Squeel's behavior when dealing with associated columns

squeel_test.rb

require 'bundler/inline'
require 'minitest/spec'
require 'minitest/autorun'

gemfile true do
  source 'https://rubygems.org'
  gem 'activerecord', '4.2.6', require: false
  gem 'sqlite3'
  gem 'squeel', '1.2.3', require: false
end

require 'arel'
require 'active_record'
require 'squeel'

ActiveRecord::Base.establish_connection(
  adapter: 'sqlite3',
  database: ':memory:'
)

ActiveRecord::Schema.define do
  create_table :owners, force: true
  create_table :dogs, force: true do |t|
    t.string :name
    t.string :breed
    t.belongs_to :owner
  end
end

class Owner < ActiveRecord::Base
  has_many :dogs
end

class Dog < ActiveRecord::Base
  belongs_to :owner
end

class SqueelTest < Minitest::Spec
  it 'works' do
    scope = Owner.joins{:dogs}.where{ breed == 'mutt' }

    scope.to_sql.must_equal %{
      SELECT "owners".* FROM "owners"
      INNER JOIN "dogs" ON "dogs"."owner_id" = "owners"."id"
      WHERE "owners"."breed" = 'mutt'
    }.squish
  end
end