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RSpec.describe Magick::ImageList, '#+' do
it 'works' do
image_list = described_class.new(*FILES[0..9])
image_list2 = described_class.new # intersection is 5..9
image_list2 << image_list[5]
image_list2 << image_list[6]
image_list2 << image_list[7]
image_list2 << image_list[8]
image_list2 << image_list[9]
image_list.scene = 7
cur = image_list.cur_image
result = image_list + image_list2
expect(result).to be_instance_of(described_class)
expect(result.length).to eq(15)
expect(image_list).not_to be(result)
expect(image_list2).not_to be(result)
expect(result.cur_image).to be(cur)
expect { image_list + [2] }.to raise_error(ArgumentError)
end
end
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