Error with lambda variable scope Not retaining local vars on creation Non rails version works as I expect

after_callbacks_test.rb

class EncryptedAttributesWithAfterCallbacksTest < MiniTest::Unit::TestCase
  def setup
    @password = ''
    @ran_callback = false
    callback = lambda { |record|
      p 'Callback being called...'
      @password = record.password
      @ran_callback = true
    }
    
    User.encrypts :password, :after => callback
    @user = User.create! :login => 'admin', :password => 'secret'
  end
  
  def test_should_run_callback
    assert @ran_callback, 'Callback should have been called'
  end
end


# Run options: 

# Running tests:

# => "Callback being called..."
# F

# 1 test, 1 assertions, 1 failures, 0 errors, 0 skips

non_rails_example.rb

require 'minitest/autorun'

class NonRails
  attr_reader :password
  
  def initialize
    @password = 'secret'
    yield self
  end
end

class NonRailsTest < MiniTest::Unit::TestCase
  def setup
    @password = ''
    @ran_callback = false
    callback = lambda { |record|
      p 'Callback being called...'
      @password = record.password
      @ran_callback = true
    }
    
    NonRails.new &callback
  end
  
  def test_should_run_callback
    assert @ran_callback, 'Callback should have been called'
  end
end


# Run options: 

# Running tests:

# => "Callback being called..."
# .

# 1 test, 1 assertions, 0 failures, 0 errors, 0 skips