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RSpec.describe Magick::Image, "#compare_channel" do
it "works" do
image1 = described_class.read(IMAGES_DIR + '/Button_0.gif').first
image2 = described_class.read(IMAGES_DIR + '/Button_1.gif').first
Magick::MetricType.values do |metric|
expect { image1.compare_channel(image2, metric) }.not_to raise_error
end
expect { image1.compare_channel(image2, 2) }.to raise_error(TypeError)
expect { image1.compare_channel }.to raise_error(ArgumentError)
expect { image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel) }.not_to raise_error
expect { image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel, Magick::BlueChannel) }.not_to raise_error
expect { image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric, 2) }.to raise_error(TypeError)
expect { image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel, 2) }.to raise_error(TypeError)
result = image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric)
expect(result).to be_instance_of(Array)
expect(result[0]).to be_instance_of(described_class)
expect(result[1]).to be_instance_of(Float)
image2.destroy!
expect { image1.compare_channel(image2, Magick::MeanAbsoluteErrorMetric) }.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.compare_channel(image_list, Magick::MeanAbsoluteErrorMetric) }.not_to raise_error
expect { image.compare_channel(image_list, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel) }.not_to raise_error
end
end
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