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RSpec.describe Magick::Image, '#shade' do
it 'works' do
image = described_class.new(20, 20)
result = image.shade
expect(result).to be_instance_of(described_class)
expect { image.shade(true) }.not_to raise_error
expect { image.shade(true, 30) }.not_to raise_error
expect { image.shade(true, 30, 30) }.not_to raise_error
expect { image.shade(true, 30, 30, 2) }.to raise_error(ArgumentError)
expect { image.shade(true, 'x') }.to raise_error(TypeError)
expect { image.shade(true, 30, 'x') }.to raise_error(TypeError)
end
end
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