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RSpec.describe Magick::Image, '#sharpen_channel' do
it 'works' do
image = described_class.new(20, 20)
result = image.sharpen_channel
expect(result).to be_instance_of(described_class)
expect { image.sharpen_channel(2.0) }.not_to raise_error
expect { image.sharpen_channel(2.0, 1.0) }.not_to raise_error
expect { image.sharpen_channel(2.0, 1.0, Magick::RedChannel) }.not_to raise_error
expect { image.sharpen_channel(2.0, 1.0, Magick::RedChannel, Magick::BlueChannel) }.not_to raise_error
expect { image.sharpen_channel(2.0, 1.0, Magick::RedChannel, 2) }.to raise_error(TypeError)
expect { image.sharpen_channel('x') }.to raise_error(TypeError)
expect { image.sharpen_channel(2.0, 'x') }.to raise_error(TypeError)
end
end
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