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RSpec.describe Magick::Image, '#quantum_operator' do
it 'works' do
image = described_class.new(20, 20)
result = image.quantum_operator(Magick::AddQuantumOperator, 2)
expect(result).to be_instance_of(described_class)
Magick::QuantumExpressionOperator.values do |op|
expect { image.quantum_operator(op, 2) }.not_to raise_error
end
expect { image.quantum_operator(Magick::AddQuantumOperator, 2, Magick::RedChannel) }.not_to raise_error
expect { image.quantum_operator(2, 2) }.to raise_error(TypeError)
expect { image.quantum_operator(Magick::AddQuantumOperator, 'x') }.to raise_error(TypeError)
expect { image.quantum_operator(Magick::AddQuantumOperator, 2, 2) }.to raise_error(TypeError)
expect { image.quantum_operator(Magick::AddQuantumOperator, 2, Magick::RedChannel, 2) }.to raise_error(ArgumentError)
end
end
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