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RSpec.describe Magick::Image, '#level_channel' do
it 'works' do
image = described_class.new(20, 20)
expect { image.level_channel }.to raise_error(ArgumentError)
result = image.level_channel(Magick::RedChannel)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.level_channel(Magick::RedChannel, 0.0) }.not_to raise_error
expect { image.level_channel(Magick::RedChannel, 0.0, 1.0) }.not_to raise_error
expect { image.level_channel(Magick::RedChannel, 0.0, 1.0, Magick::QuantumRange) }.not_to raise_error
expect { image.level_channel(Magick::RedChannel, 0.0, 1.0, Magick::QuantumRange, 2) }.to raise_error(ArgumentError)
expect { image.level_channel(2) }.to raise_error(TypeError)
expect { image.level_channel(Magick::RedChannel, 'x') }.to raise_error(TypeError)
expect { image.level_channel(Magick::RedChannel, 0.0, 'x') }.to raise_error(TypeError)
expect { image.level_channel(Magick::RedChannel, 0.0, 1.0, 'x') }.to raise_error(TypeError)
end
end
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