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RSpec.describe Magick::ImageList, "#morph" do
it "works" do
image_list = described_class.new
# can't morph an empty image_list
expect { image_list.morph(1) }.to raise_error(ArgumentError)
image_list.read(IMAGES_DIR + '/Button_0.gif', IMAGES_DIR + '/Button_1.gif')
# can't specify a negative argument
expect { image_list.morph(-1) }.to raise_error(ArgumentError)
result = image_list.morph(2)
expect(result).to be_instance_of(described_class)
expect(result.length).to eq(4)
expect(result.scene).to eq(0)
end
end
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