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RSpec.describe Magick::Image, '#transparent' do
it 'works' do
image = described_class.new(20, 20)
result = image.transparent('white')
expect(result).to be_instance_of(described_class)
pixel = Magick::Pixel.new
expect { image.transparent(pixel) }.not_to raise_error
expect { image.transparent('white', Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent('white', alpha: Magick::TransparentAlpha) }.not_to raise_error
expect { image.transparent('white', wrong: Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent('white', alpha: Magick::TransparentAlpha, extra: Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent('white', Magick::TransparentAlpha, 2) }.to raise_error(ArgumentError)
expect { image.transparent('white', Magick::QuantumRange / 2) }.to raise_error(ArgumentError)
expect { image.transparent(2) }.to raise_error(TypeError)
end
end
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