File: preview_spec.rb

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describe Magick::Image, '#preview' do
  it 'works', unsupported_before('6.8.0') do
    hat = described_class.read(IMAGES_DIR + '/Flower_Hat.jpg').first

    prev = hat.preview(Magick::RotatePreview)
    expect(prev).to be_instance_of(described_class)

    Magick::PreviewType.values do |type|
      expect { hat.preview(type) }.not_to raise_error
    end
    expect { hat.preview(2) }.to raise_error(TypeError)
  end
end