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RSpec.describe Magick::Image, '#composite_mathematics' do
it 'works' do
bg = described_class.new(50, 50)
fg = described_class.new(50, 50) { |options| options.background_color = 'black' }
result = bg.composite_mathematics(fg, 1, 0, 0, 0, Magick::CenterGravity)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(bg)
expect(result).not_to be(fg)
expect { bg.composite_mathematics(fg, 1, 0, 0, 0, 0.0, 0.0) }.not_to raise_error
expect { bg.composite_mathematics(fg, 1, 0, 0, 0, Magick::CenterGravity, 0.0, 0.0) }.not_to raise_error
# too few arguments
expect { bg.composite_mathematics(fg, 1, 0, 0, 0) }.to raise_error(ArgumentError)
# too many arguments
expect { bg.composite_mathematics(fg, 1, 0, 0, 0, Magick::CenterGravity, 0.0, 0.0, 'x') }.to raise_error(ArgumentError)
end
it 'accepts an ImageList argument' do
image = described_class.new(20, 20)
image_list = Magick::ImageList.new
image_list.new_image(10, 10)
expect { image.composite_mathematics(image_list, 1, 0, 0, 0, Magick::CenterGravity) }.not_to raise_error
expect { image.composite_mathematics(image_list, 1, 0, 0, 0, 0.0, 0.0) }.not_to raise_error
end
end
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