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RSpec.describe Magick::Image, '#opaque_channel' do
it 'works' do
image = described_class.new(20, 20)
result = image.opaque_channel('white', 'red')
expect(result).not_to be(nil)
expect(result).to be_instance_of(described_class)
expect(image).not_to be(result)
expect { image.opaque_channel('red', 'blue', true) }.not_to raise_error
expect { image.opaque_channel('red', 'blue', true, 50) }.not_to raise_error
expect { image.opaque_channel('red', 'blue', true, 50, Magick::RedChannel) }.not_to raise_error
expect { image.opaque_channel('red', 'blue', true, 50, Magick::RedChannel, Magick::GreenChannel) }.not_to raise_error
expect do
image.opaque_channel('red', 'blue', true, 50, Magick::RedChannel, Magick::GreenChannel, Magick::BlueChannel)
end.not_to raise_error
expect { image.opaque_channel('red', 'blue', true, 50, 50) }.to raise_error(TypeError)
expect { image.opaque_channel('red', 'blue', true, []) }.to raise_error(TypeError)
expect { image.opaque_channel('red') }.to raise_error(ArgumentError)
expect { image.opaque_channel('red', 'blue', true, -0.1) }.to raise_error(ArgumentError)
expect { image.opaque_channel('red', []) }.to raise_error(TypeError)
end
end
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