#!/usr/bin/ruby
require 'test/unit'
require 'docdiff/difference'

class TC_DocDiff_Difference < Test::Unit::TestCase
  Difference = DocDiff::Difference

  def setup()
    #
  end

  def test_new()
    array1 = [:a, :b, :c]
    array2 = [:a, :x, :c]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:change_elt,     [:b], [:x]],
                  [:common_elt_elt, [:c], [:c]]]
    assert_equal(expected, Difference.new(array1, array2))
  end

  def test_raw_list()
    array1 = [:a, :b, :c]
    array2 = [:a, :x, :c]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:del_elt,        [:b], nil],
                  [:add_elt,         nil, [:x]],
                  [:common_elt_elt, [:c], [:c]]]
    assert_equal(expected, Difference.new(array1, array2).raw_list)
  end

  def test_former_only()
    array1 = [:a, :b, :c]
    array2 = [:a, :x, :c]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:change_elt,     [:b], nil],
                  [:common_elt_elt, [:c], [:c]]]
    assert_equal(expected, Difference.new(array1, array2).former_only)
    array1 = [:a, :b, :c]
    array2 = [:a, :c, :d]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:del_elt,        [:b], nil],
                  [:common_elt_elt, [:c], [:c]]]
    assert_equal(expected, Difference.new(array1, array2).former_only)
  end

  def test_latter_only()
    array1 = [:a, :b, :c]
    array2 = [:a, :x, :c]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:change_elt,     nil,  [:x]],
                  [:common_elt_elt, [:c], [:c]]]
    assert_equal(expected, Difference.new(array1, array2).latter_only)
    array1 = [:a, :b, :c]
    array2 = [:a, :c, :d]
    expected =   [[:common_elt_elt, [:a], [:a]],
                  [:common_elt_elt, [:c], [:c]],
                  [:add_elt,        nil,  [:d]]]
    assert_equal(expected, Difference.new(array1, array2).latter_only)
  end

  def teardown()
    #
  end

end