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RSpec.describe Magick::Draw, '#alpha' do
it 'works' do
draw = described_class.new
image = Magick::Image.new(200, 200)
Magick::PaintMethod.values do |method|
draw = described_class.new
draw.alpha(10, '20.5', method)
expect { draw.draw(image) }.not_to raise_error
end
expect { draw.alpha(10, '20.5', 'xxx') }.to raise_error(ArgumentError)
expect { draw.alpha('x', 10, Magick::PointMethod) }.to raise_error(ArgumentError)
expect { draw.alpha(10, 'x', Magick::PointMethod) }.to raise_error(ArgumentError)
end
end
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