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RSpec.describe Magick::Image, '#gaussian_blur' do
it 'works' do
image = described_class.new(20, 20)
result = image.gaussian_blur
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.gaussian_blur(0.0) }.not_to raise_error
expect { image.gaussian_blur(0.0, 3.0) }.not_to raise_error
# sigma must be != 0.0
expect { image.gaussian_blur(1.0, 0.0) }.to raise_error(ArgumentError)
expect { image.gaussian_blur(1.0, 3.0, 2) }.to raise_error(ArgumentError)
end
end
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