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RSpec.describe Magick::ImageList, '#combine' do
it 'works' do
red = Magick::Image.new(20, 20) { |options| options.background_color = 'red' }
green = Magick::Image.new(20, 20) { |options| options.background_color = 'green' }
blue = Magick::Image.new(20, 20) { |options| options.background_color = 'blue' }
black = Magick::Image.new(20, 20) { |options| options.background_color = 'black' }
alpha = Magick::Image.new(20, 20) { |options| options.background_color = 'transparent' }
image_list = described_class.new
expect { image_list.combine }.to raise_error(ArgumentError)
image_list << red
expect { image_list.combine }.not_to raise_error
result = image_list.combine
expect(result).to be_instance_of(Magick::Image)
image_list << alpha
expect { image_list.combine }.not_to raise_error
image_list.pop
image_list << green
image_list << blue
expect { image_list.combine }.not_to raise_error
image_list << alpha
expect { image_list.combine }.not_to raise_error
image_list.pop
image_list << black
expect { image_list.combine(Magick::CMYKColorspace) }.not_to raise_error
expect { image_list.combine(Magick::SRGBColorspace) }.not_to raise_error
image_list << alpha
expect { image_list.combine(Magick::CMYKColorspace) }.not_to raise_error
expect { image_list.combine(Magick::SRGBColorspace) }.to raise_error(ArgumentError)
image_list << alpha
expect { image_list.combine }.to raise_error(ArgumentError)
expect { image_list.combine(nil) }.to raise_error(TypeError)
expect { image_list.combine(Magick::SRGBColorspace, 1) }.to raise_error(ArgumentError)
end
end
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