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RSpec.describe Magick::Image, '#export_pixels_to_str' do
it 'works' do
image = described_class.new(20, 20)
result = image.export_pixels_to_str
expect(result).to be_instance_of(String)
expect(result.length).to eq(image.columns * image.rows * 'RGB'.length)
expect { image.export_pixels_to_str(0) }.not_to raise_error
expect { image.export_pixels_to_str(0, 0) }.not_to raise_error
expect { image.export_pixels_to_str(0, 0, 10) }.not_to raise_error
expect { image.export_pixels_to_str(0, 0, 10, 10) }.not_to raise_error
result = image.export_pixels_to_str(0, 0, 10, 10, 'RGBA')
expect(result.length).to eq(10 * 10 * 'RGBA'.length)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I')
expect(result.length).to eq(10 * 10 * 'I'.length)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::CharPixel)
expect(result.length).to eq(10 * 10 * 1)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::ShortPixel)
expect(result.length).to eq(10 * 10 * 2)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::LongPixel)
expect(result.length).to eq(10 * 10 * [1].pack('L!').length)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::FloatPixel)
expect(result.length).to eq(10 * 10 * 4)
result = image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::DoublePixel)
expect(result.length).to eq(10 * 10 * 8)
expect { image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::QuantumPixel) }.not_to raise_error
# too many arguments
expect { image.export_pixels_to_str(0, 0, 10, 10, 'I', Magick::QuantumPixel, 1) }.to raise_error(ArgumentError)
# last arg s/b StorageType
expect { image.export_pixels_to_str(0, 0, 10, 10, 'I', 2) }.to raise_error(TypeError)
end
end
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