def test_color
    assert_raise(ArgumentError) { @item.color = -7 }
    assert_nothing_raised { @item.color = Axlsx::Color.new(:rgb=>"00000000") }
    assert(@item.color.is_a?(Axlsx::Color))
  end
def color=(v) DataTypeValidator.validate "Font.color", Color, v; @color=v end