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RSpec.describe Magick::Image, '#mean_error_per_pixel' do
it 'works' do
hat = described_class.read(FLOWER_HAT).first
expect { hat.mean_error_per_pixel }.not_to raise_error
expect { hat.normalized_mean_error }.not_to raise_error
expect { hat.normalized_maximum_error }.not_to raise_error
expect(hat.mean_error_per_pixel).to eq(0.0)
expect(hat.normalized_mean_error).to eq(0.0)
expect(hat.normalized_maximum_error).to eq(0.0)
hat2 = hat.quantize(16, Magick::RGBColorspace, true, 0, true)
expect(hat2.mean_error_per_pixel).not_to eq(0.0)
expect(hat2.normalized_mean_error).not_to eq(0.0)
expect(hat2.normalized_maximum_error).not_to eq(0.0)
expect { hat2.mean_error_per_pixel = 1 }.to raise_error(NoMethodError)
expect { hat2.normalized_mean_error = 1 }.to raise_error(NoMethodError)
expect { hat2.normalized_maximum_error = 1 }.to raise_error(NoMethodError)
end
end
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