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# frozen_string_literal: true
require 'spec_helper'
describe Prawn::ImageHandler do
let(:image_handler) { described_class.new }
let(:handler_a) { instance_double('Handler A') }
let(:handler_b) { instance_double('Handler B') }
it 'finds the image handler for an image' do
allow(handler_a).to receive(:can_render?).and_return(true)
image_handler.register(handler_a)
image_handler.register(handler_b)
handler = image_handler.find('arbitrary blob')
expect(handler).to eq(handler_a)
end
it 'can prepend handlers' do
allow(handler_b).to receive(:can_render?).and_return(true)
image_handler.register(handler_a)
image_handler.register!(handler_b)
handler = image_handler.find('arbitrary blob')
expect(handler).to eq(handler_b)
end
it 'can unregister a handler' do
allow(handler_b).to receive(:can_render?).and_return(true)
image_handler.register(handler_a)
image_handler.register(handler_b)
image_handler.unregister(handler_a)
handler = image_handler.find('arbitrary blob')
expect(handler).to eq(handler_b)
end
it 'raises an error when no matching handler is found' do
allow(handler_a).to receive(:can_render?).and_return(false)
allow(handler_b).to receive(:can_render?).and_return(false)
image_handler.register(handler_a)
image_handler.register(handler_b)
expect { image_handler.find('arbitrary blob') }
.to(raise_error(Prawn::Errors::UnsupportedImageType))
end
end
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