require File.dirname(__FILE__) + '/abstract_unit'
require File.dirname(__FILE__) + '/fixtures/person'

class ActsAsChangedTest < Test::Unit::TestCase
  fixtures :people
  
  def test_changed_attributes_initial_value
    assert_equal [], Person.new.changed_attributes
    assert_equal [], people(:jonathan).changed_attributes
  end
  
  def test_new_record_not_changed
    assert !Person.new.changed?
  end
  
  def test_loaded_record_not_changed
    assert !Person.find(:first).changed?
  end
  
  def test_change_attribute
    people(:jonathan).name = 'Jonathan'
    assert !people(:jonathan).changed?
    
    people(:jonathan).name = 'Commander Keen'
    assert people(:jonathan).changed?
  end
  
  def test_method_missing
    p = people(:jonathan)
    
    assert !p.name_changed?
    p.name = 'Jonathan'
    assert !p.name_changed?
    assert_equal 'Jonathan', p.name
    
    p.name = 'Changed'
    assert p.name_changed?
    assert_equal 'Changed', p.name
  end
  
  def test_reload_should_clear_changed_attributes
    p = people(:jonathan)
    assert p.update_attributes(:name => 'Changed')
    assert p.changed?
    p.reload
    assert !p.changed?
  end
  
  def test_attributes_immutable
    p = people(:jonathan)
    
    assert_raises(TypeError) { p.name << ", Mr" }
    assert_raises(TypeError) { p.name.gsub!(p.name[0..2], '') }
  end
  
  def test_changed_attributes
    p = people(:jonathan)
    
    assert_equal [], p.changed_attributes
    
    # Handed back a copy of the instance variable
    p.changed_attributes << 'should be added to duplicate'
    assert_equal [], p.changed_attributes
    
    # Attributes should only appear once in changed_attributes
    p.name = 'Captain Comic'
    assert_equal ['name'], p.changed_attributes
    p.name = 'Captain Comic 2'
    assert_equal ['name'], p.changed_attributes
  end
  
  def test_reset_attributes
    p = people(:jonathan)
    
    p.name = "Agent orange"
    p.lucky_number = 666
    
    assert p.name_changed?
    assert p.lucky_number_changed?
    assert p.changed?
    assert_equal ['name', 'lucky_number'], p.changed_attributes
    
    p.reset_attributes
    
    assert_equal [], p.changed_attributes
    assert !p.name_changed?
    assert !p.lucky_number_changed?
    assert !p.changed?
  end
  
  def test_save_with_no_changes
    assert people(:jonathan).save
  end
end