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acts_as_list_test.rb #
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def test_delete_middle
  assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
 
  ListMixin.find(2).destroy
 
  assert_equal [1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
 
  assert_equal 1, ListMixin.find(1).pos
  assert_equal 2, ListMixin.find(3).pos
  assert_equal 3, ListMixin.find(4).pos
 
  ListMixin.find(1).destroy
 
  assert_equal [3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)
 
  assert_equal 1, ListMixin.find(3).pos
  assert_equal 2, ListMixin.find(4).pos
end