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RSpec.describe Magick::Draw, '#font_style' do
it 'works' do
draw = described_class.new
image = Magick::Image.new(200, 200)
draw.font_style(Magick::NormalStyle)
expect(draw.inspect).to eq('font-style normal')
draw.text(50, 50, 'Hello world')
expect { draw.draw(image) }.not_to raise_error
draw = described_class.new
draw.font_style(Magick::ItalicStyle)
expect(draw.inspect).to eq('font-style italic')
draw.text(50, 50, 'Hello world')
expect { draw.draw(image) }.not_to raise_error
draw = described_class.new
draw.font_style(Magick::ObliqueStyle)
expect(draw.inspect).to eq('font-style oblique')
draw.text(50, 50, 'Hello world')
expect { draw.draw(image) }.not_to raise_error
expect { draw.font_style('xxx') }.to raise_error(ArgumentError)
end
end
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