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class TestDenseUnionDataType < Test::Unit::TestCase
  def setup
    @number_field_data_type = Arrow::Int32DataType.new
    @text_field_data_type = Arrow::StringDataType.new
    @field_data_types = [
      @number_field_data_type,
      @text_field_data_type,
    ]
    @number_field = Arrow::Field.new("number", @number_field_data_type)
    @text_field = Arrow::Field.new("text", @text_field_data_type)
    @fields = [
      @number_field,
      @text_field,
    ]
    @data_type = Arrow::DenseUnionDataType.new(@fields, [2, 9])
  end

  def test_type
    assert_equal(Arrow::Type::DENSE_UNION, @data_type.id)
  end

  def test_name
    assert_equal("dense_union", @data_type.name)
  end

  def test_to_s
    assert_equal("dense_union<number: int32=2, text: string=9>",
                 @data_type.to_s)
  end

  def test_fields
    assert_equal(@fields.zip(@field_data_types),
                 @data_type.fields.collect {|field| [field, field.data_type]})
  end

  def test_get_field
    field = @data_type.get_field(0)
    assert_equal([
                   @fields[0],
                   @field_data_types[0],
                 ],
                 [
                   field,
                   field.data_type,
                 ])
  end
end
