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RSpec.describe Magick::Image, '#convolve' do
it 'works' do
image = described_class.new(20, 20)
kernel = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0]
order = 3
result = image.convolve(order, kernel)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.convolve }.to raise_error(ArgumentError)
expect { image.convolve(0) }.to raise_error(ArgumentError)
expect { image.convolve(-1) }.to raise_error(ArgumentError)
expect { image.convolve(order) }.to raise_error(ArgumentError)
expect { image.convolve(5, kernel) }.to raise_error(IndexError)
expect { image.convolve(order, 'x') }.to raise_error(IndexError)
expect { image.convolve(3, [1.0, 1.0, 1.0, 1.0, 'x', 1.0, 1.0, 1.0, 1.0]) }.to raise_error(TypeError)
expect { image.convolve(-1, [1.0, 1.0, 1.0, 1.0]) }.to raise_error(ArgumentError)
end
end
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