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RSpec.describe Magick::Image, '#compose' do
it 'works' do
image = described_class.new(100, 100)
expect { image.compose }.not_to raise_error
expect(image.compose).to be_instance_of(Magick::CompositeOperator)
expect(image.compose).to eq(Magick::OverCompositeOp)
expect { image.compose = 2 }.to raise_error(TypeError)
expect { image.compose = Magick::UndefinedCompositeOp }.not_to raise_error
expect(image.compose).to eq(Magick::UndefinedCompositeOp)
Magick::CompositeOperator.values do |composite|
expect { image.compose = composite }.not_to raise_error
end
expect { image.compose = 2 }.to raise_error(TypeError)
end
end
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