spec helper for inclusion by specs that don't need/depend on the entire rails environment. In JRuby, specs that don't load entire rails env run significantly faster.

active_record_spec_helper.rb

unless self.class.const_defined?('APP_ROOT')
  APP_ROOT = File.expand_path(File.dirname(__FILE__) + '/../../../../../')
end

puts "#{File.basename(__FILE__)}: APP_ROOT: #{APP_ROOT}"

require File.expand_path("#{File.dirname(__FILE__)}/no_rails_env_spec_helper")

unless self.class.const_defined?('Rails')
  require 'benchmark'

  print "loading environment "
  puts("took " + Benchmark.measure do

      require 'active_record'
      require 'active_support'

      require 'active_support/test_case'
      require 'spec/test/unit'

      require 'spec/rails/extensions/spec/matchers/have'
      require 'spec/rails/extensions/active_record/base'
      require 'spec/rails/interop/testcase'

      require 'spec/runner/configuration'
      require 'active_record/test_case'
      require 'spec/rails/extensions/spec/matchers/have'
      require 'spec/rails/extensions/active_record/base'

      require "spec/rails/example/model_example_group"
    end.real.to_s)

  ENV['RAILS_ENV'] = 'test'

  if self.class.const_defined?(:Rails)
    puts "#{File.basename(__FILE__)}:  Full Rails Environment is already loaded"
    require 'spec/rails'
  else
    print "establishing connection "
    require 'erb'
    puts("took " + Benchmark.measure do
      config_yml = YAML::load(ERB.new(File.read("#{APP_ROOT}/config/database.yml")).result)
      ActiveRecord::Base.establish_connection(config_yml['test'])
    end.real.to_s)

    ActiveRecord::Base.logger = Logger.new("#{APP_ROOT}/log/test.log")


    Time.zone = ActiveRecord::Base.default_timezone = 'Eastern Time (US & Canada)'
    ActiveRecord::Base.time_zone_aware_attributes = true
  end
end

no_rails_env_spec_helper.rb

# Author: Lenny
# Date: 20Feb09
#
# This is a spec_helper for inclusion by specs that don't
# need/depend on the entire rails environment such as code
# in the lib or models director of a Rails app. Specs
# that don't load the entire rails environment run significantly
# faster, especially under JRuby. 
#
require 'java'
require 'rubygems'
require 'spec'

unless self.class.const_defined?('APP_ROOT')
  # For me this file lives in vendor/plugins/myplugin/spec/support
  APP_ROOT = File.expand_path(File.dirname(__FILE__) + '/../../../../../')
end

puts "no_rails_env_spec_helper APP_ROOT: #{APP_ROOT}"

if ENV['RAILS_ENV'] && !self.class.const_defined?('Rails')
  # The minimal environment spec helpers are not needed if the full Rails
  # environment has already been loaded. Any manual 'requiring' of application
  # files will cause undesired behavior from class loading contention
  # with Rails. Since Rails uses its own Dependencies/require_dependency/require
  # mechanism, it will result in application classes being loaded multiple times
  # if the Rails env happens to be loaded after the files have been
  # manually required(e.g. by a no_rails_env_spec_helper spec). Some classes
  # cannot be reloaded without the special unloading that the Rails Dependecies
  # machanism does. For example, validation callbacks(e.g. validate_on_create, etc..)
  # will be triggered once for each time an ActiveRecord model class is loaded, which
  # leads to difficult to track down spec failures(e.g. mocked method expected once bu
  # received twice). To avoid the entire situation while still allowing the run
  # of individual specs not dependent on Rails to use the fast, minimal
  # environment when run individually, we assume that the Rails environment is required
  # if RAILS_ENV is set and pre-load it before any manual requires are hit.
  
  puts "#{File.basename(__FILE__)}: RAILS_ENV was set. Loading full Rails environment to avoid class loading contention."
  require File.expand_path(APP_ROOT + '/config/environment.rb')
end

if self.class.const_defined?('Rails')
  puts "\n\n#{File.basename(__FILE__)}: **Note**\n  *Rails environment is already loaded.*\n " +
  "  This may either be because one of the spec files you " +
  "are running has loaded it or because your " +
  "script/spec file(used automatically by netbeans) needs editing.\n\n"
else
  puts "#{File.basename(__FILE__)}: Full Rails environment not loaded; Setting up minimal environment."

  module Kernel
    def require_dependency(file)
      require(file)
    end
  end

  require 'active_support/core_ext/object/blank'
end