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RSpec.describe Magick::Image, '#fx' do
it 'works' do
image = described_class.new(20, 20)
expect { image.fx('1/2') }.not_to raise_error
expect { image.fx('1/2', Magick::BlueChannel) }.not_to raise_error
expect { image.fx('1/2', Magick::BlueChannel, Magick::RedChannel) }.not_to raise_error
expect { image.fx }.to raise_error(ArgumentError)
expect { image.fx(Magick::BlueChannel) }.to raise_error(ArgumentError)
expect { image.fx(1) }.to raise_error(TypeError)
expect { image.fx('1/2', 1) }.to raise_error(TypeError)
end
end
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