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RSpec.describe Magick::Image, '#transparent_chroma' do
it 'works' do
image = described_class.new(20, 20)
expect(image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange))).to be_instance_of(described_class)
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange)) }.not_to raise_error
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), alpha: Magick::TransparentAlpha) }.not_to raise_error
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), wrong: Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), Magick::TransparentAlpha, true) }.to raise_error(ArgumentError)
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), true, alpha: Magick::TransparentAlpha) }.not_to raise_error
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), false, wrong: Magick::TransparentAlpha) }.to raise_error(ArgumentError)
expect { image.transparent_chroma('white', Magick::Pixel.new(Magick::QuantumRange), false, alpha: Magick::TransparentAlpha, extra: Magick::TransparentAlpha) }.to raise_error(ArgumentError)
end
end
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