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RSpec.describe Magick::Image, '#difference' do
it 'works' do
image1 = described_class.read(IMAGES_DIR + '/Button_0.gif').first
image2 = described_class.read(IMAGES_DIR + '/Button_1.gif').first
result = image1.difference(image2)
expect(result).to be_instance_of(Array)
expect(result.length).to eq(3)
expect(result[0]).to be_instance_of(Float)
expect(result[0]).not_to eq(0.0)
expect(result[1]).to be_instance_of(Float)
expect(result[1]).not_to eq(0.0)
expect(result[2]).to be_instance_of(Float)
expect(result[2]).not_to eq(0.0)
expect { image1.difference(2) }.to raise_error(NoMethodError)
image2.destroy!
expect { image1.difference(image2) }.to raise_error(Magick::DestroyedImageError)
end
it 'accepts an ImageList argument' do
image = described_class.new(20, 20)
image_list = Magick::ImageList.new
image_list.new_image(20, 20)
expect { image.difference(image_list) }.not_to raise_error
end
end
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