RSpec.describe Magick::Draw, '#bezier' do
  it 'works' do
    draw = described_class.new
    image = Magick::Image.new(200, 200)

    draw.bezier(10, '20', '20.5', 30, 40.5, 50)
    expect(draw.inspect).to eq('bezier 10,20,20.5,30,40.5,50')
    expect { draw.draw(image) }.not_to raise_error

    expect { draw.bezier }.to raise_error(ArgumentError)
    expect { draw.bezier(1) }.to raise_error(ArgumentError)
    expect { draw.bezier('x', 20, 30, 40.5) }.to raise_error(ArgumentError)
  end
end