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RSpec.describe Magick::Image, "#adaptive_sharpen_channel" do
it "works" do
image = described_class.new(20, 20)
result = image.adaptive_sharpen_channel
expect(result).to be_instance_of(described_class)
expect { image.adaptive_sharpen_channel(2) }.not_to raise_error
expect { image.adaptive_sharpen_channel(3, 2) }.not_to raise_error
expect { image.adaptive_sharpen_channel(3, 2, Magick::RedChannel) }.not_to raise_error
expect { image.adaptive_sharpen_channel(3, 2, Magick::RedChannel, Magick::BlueChannel) }.not_to raise_error
expect { image.adaptive_sharpen_channel(3, 2, 2) }.to raise_error(TypeError)
end
end
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