require 'test/unit'

class TestEncoding < Test::Unit::TestCase

  # Test basic encoding methods: list, find, name
  def test_encoding
    encodings = Encoding.list
    assert_equal(encodings.empty?, false)

    encodings.each do |e|
      assert_equal(e, Encoding.find(e.name))
      assert_equal(e, Encoding.find(e.name.upcase))
      assert_equal(e, Encoding.find(e.name.capitalize))
      assert_equal(e, Encoding.find(e.name.downcase))
    end
  end
  
  def test_enc_names
    aliases = Encoding.aliases
    aliases.each do |a, en|
      e = Encoding.find(a)
      assert_equal(e.name, en)
      assert(e.names.include?(a))
    end
  end

  # Test that Encoding objects can't be copied
  # And that they can be compared by object_id
  def test_singleton
    encodings = Encoding.list
    encodings.each do |e|
      assert_raise(TypeError) { e.dup }
      assert_raise(TypeError) { e.clone }
      assert_equal(e.object_id, Marshal.load(Marshal.dump(e)).object_id)
    end    
  end

  def test_find
    assert_raise(ArgumentError) { Encoding.find("foobarbazqux") }
  end

  def test_dummy_p
    assert_equal(true, Encoding::ISO_2022_JP.dummy?)
    assert_equal(false, Encoding::UTF_8.dummy?)
  end

  def test_name_list
    assert_instance_of(Array, Encoding.name_list)
    Encoding.name_list.each do |x|
      assert_instance_of(String, x)
    end
  end

  def test_aliases
    assert_instance_of(Hash, Encoding.aliases)
    Encoding.aliases.each do |k, v|
      assert(Encoding.name_list.include?(k))
      assert(Encoding.name_list.include?(v))
      assert_instance_of(String, k)
      assert_instance_of(String, v)
    end
  end
end
