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RSpec.describe Magick::Image, '#convolve_channel' do
it 'works' do
image = described_class.new(20, 20)
expect { image.convolve_channel }.to raise_error(ArgumentError)
expect { image.convolve_channel(0) }.to raise_error(ArgumentError)
expect { image.convolve_channel(-1) }.to raise_error(ArgumentError)
expect { image.convolve_channel(3) }.to raise_error(ArgumentError)
kernel = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
order = 3
result = image.convolve_channel(order, kernel, Magick::RedChannel)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.convolve_channel(order, kernel, Magick::RedChannel, Magick::BlueChannel) }.not_to raise_error
expect { image.convolve_channel(order, kernel, Magick::RedChannel, 2) }.to raise_error(TypeError)
expect { image.convolve_channel(order, 1234) }.to raise_error(IndexError)
end
end
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