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RSpec.describe Magick::Image, '#vignette' do
it 'works' do
image = described_class.new(20, 20)
result = image.vignette
expect(result).to be_instance_of(described_class)
expect(image).not_to be(result)
expect { image.vignette(0) }.not_to raise_error
expect { image.vignette(0, 0) }.not_to raise_error
expect { image.vignette(0, 0, 0) }.not_to raise_error
expect { image.vignette(0, 0, 0, 1) }.not_to raise_error
# too many arguments
expect { image.vignette(0, 0, 0, 1, 1) }.to raise_error(ArgumentError)
end
end
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