RSpec.describe Magick::Draw, '#font_weight=' do
  it 'works' do
    draw = described_class.new

    Magick::WeightType.values do |weight|
      expect { draw.font_weight = weight }.not_to raise_error
    end

    expect { draw.font_weight = 99 }.to raise_error(ArgumentError)
    expect { draw.font_weight = 901 }.to raise_error(ArgumentError)
  end
end