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RSpec.describe Magick::Image, '#sparse_color' do
it 'works' do
image = described_class.new(100, 100)
args = [30, 10, 'red', 10, 80, 'blue', 70, 60, 'lime', 80, 20, 'yellow']
# ensure good calls work
Magick::SparseColorMethod.values do |v|
next if v == Magick::UndefinedColorInterpolate
expect { image.sparse_color(v, *args) }.not_to raise_error
end
args << Magick::RedChannel
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.not_to raise_error
args << Magick::GreenChannel
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.not_to raise_error
args << Magick::BlueChannel
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.not_to raise_error
# bad calls
args = [30, 10, 'red', 10, 80, 'blue', 70, 60, 'lime', 80, 20, 'yellow']
# invalid method
expect { image.sparse_color(1, *args) }.to raise_error(TypeError)
# missing arguments
expect { image.sparse_color(Magick::VoronoiColorInterpolate) }.to raise_error(ArgumentError)
args << 10 # too many arguments
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.to raise_error(ArgumentError)
args.shift
args.shift # too few
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.to raise_error(ArgumentError)
args = [30, 10, 'red', 10, 80, 'blue', 70, 60, 'lime', 80, '20', 'yellow']
expect { image.sparse_color(Magick::VoronoiColorInterpolate, *args) }.to raise_error(TypeError)
end
end
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