require File.join(File.dirname(__FILE__), 'test_helper')

class CalculatedAttributeTest < Test::Unit::TestCase
  fixtures :invoices, :line_items, :payments

  def test_subtotal
    assert_equal 10, invoices(:two_lines).subtotal
    assert_equal 5, invoices(:one_line_one_payment).subtotal
  end
  
  def test_paid
    assert_equal 0, invoices(:two_lines).paid
    assert_equal 2, invoices(:one_line_one_payment).paid
  end
  
  def test_total
    assert_equal 10, invoices(:two_lines).total
    assert_equal 5, invoices(:one_line_one_payment).total
  end
  
  def test_due
    assert_equal 10, invoices(:two_lines).due
    assert_equal 3, invoices(:one_line_one_payment).due
  end

  def test_subtotal_cached_on_save
    assert invoices(:two_lines).attributes['subtotal'].nil?
    invoices(:two_lines).save
    assert_equal 10, invoices(:two_lines).attributes['subtotal']
  end

  def test_subtotal_setter_should_be_noop
    assert_equal 10, invoices(:two_lines).subtotal
    invoices(:two_lines).subtotal = 15
    assert_equal 10, invoices(:two_lines).subtotal
  end

  def test_add_line_recalculates_subtotal
    invoices(:two_lines).save # cache subtotal
    assert_equal 10, invoices(:two_lines).attributes['subtotal']
    invoices(:two_lines).line_items << LineItem.new(:total => 5)
    assert_equal 15, invoices(:two_lines).subtotal
    assert_equal 15, invoices(:two_lines).attributes['subtotal']
  end

  def test_remove_line_recaches_subtotal
    invoices(:two_lines).save
    assert_equal 10, invoices(:two_lines).attributes['subtotal']
    invoices(:two_lines).line_items.delete line_items(:li1)
    assert_equal 5, invoices(:two_lines).subtotal
    assert_equal 5, invoices(:two_lines).attributes['subtotal']
  end
  
end