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RSpec.describe Magick::Image, '#gamma_correct' do
it 'works' do
image = described_class.new(20, 20)
expect { image.gamma_correct }.to raise_error(ArgumentError)
result = image.gamma_correct(0.8)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.gamma_correct(0.8, 0.9) }.not_to raise_error
expect { image.gamma_correct(0.8, 0.9, 1.0) }.not_to raise_error
expect { image.gamma_correct(0.8, 0.9, 1.0, 1.1) }.not_to raise_error
# too many arguments
expect { image.gamma_correct(0.8, 0.9, 1.0, 1.1, 2) }.to raise_error(ArgumentError)
end
end
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