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RSpec.describe Magick::Pixel, '#<=>' do
it 'works' do
pixel = described_class.from_color('brown')
pixel.red = 100
pixel2 = pixel.dup
expect(pixel <=> pixel2).to eq(0)
pixel2.red -= 10
expect(pixel <=> pixel2).to eq(1)
pixel2.red += 20
expect(pixel <=> pixel2).to eq(-1)
pixel.green = 100
pixel2 = pixel.dup
pixel2.green -= 10
expect(pixel <=> pixel2).to eq(1)
pixel2.green += 20
expect(pixel <=> pixel2).to eq(-1)
pixel.blue = 100
pixel2 = pixel.dup
pixel2.blue -= 10
expect(pixel <=> pixel2).to eq(1)
pixel2.blue += 20
expect(pixel <=> pixel2).to eq(-1)
pixel.alpha = 100
pixel2 = pixel.dup
pixel2.alpha -= 10
expect(pixel <=> pixel2).to eq(1)
pixel2.alpha += 20
expect(pixel <=> pixel2).to eq(-1)
expect(pixel <=> Object.new).to be(nil)
end
end
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