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RSpec.describe Magick::Image, '#matte_fill_to_border' do
it 'works' do
image = described_class.new(20, 20)
result = image.matte_fill_to_border(image.columns / 2, image.rows / 2)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.matte_fill_to_border(image.columns, image.rows) }.not_to raise_error
expect { image.matte_fill_to_border(image.columns + 1, image.rows) }.to raise_error(ArgumentError)
expect { image.matte_fill_to_border(image.columns, image.rows + 1) }.to raise_error(ArgumentError)
end
end
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