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RSpec.describe Magick::Image, '#sketch' do
it 'works' do
image = described_class.new(20, 20)
expect { image.sketch }.not_to raise_error
expect { image.sketch(0) }.not_to raise_error
expect { image.sketch(0, 1) }.not_to raise_error
expect { image.sketch(0, 1, 0) }.not_to raise_error
expect { image.sketch(0, 1, 0, 1) }.to raise_error(ArgumentError)
expect { image.sketch('x') }.to raise_error(TypeError)
expect { image.sketch(0, 'x') }.to raise_error(TypeError)
expect { image.sketch(0, 1, 'x') }.to raise_error(TypeError)
end
end
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