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RSpec.describe Magick::Image, "#spaceship" do
it "works" do
image0 = described_class.read(IMAGES_DIR + '/Button_0.gif').first
image1 = described_class.read(IMAGES_DIR + '/Button_1.gif').first
sig0 = image0.signature
sig1 = image1.signature
# since <=> is based on the signature, the images should
# have the same relationship to each other as their
# signatures have to each other.
expect(image0 <=> image1).to eq(sig0 <=> sig1)
expect(image1 <=> image0).to eq(sig1 <=> sig0)
expect(image0).to eq(image0)
expect(image1).not_to eq(image0)
expect(image0 <=> nil).to be(nil)
end
end
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