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# encoding: utf-8
require File.join(File.expand_path(File.dirname(__FILE__)), "spec_helper")
describe "ImageHandler" do
let(:image_handler) { Prawn::ImageHandler.new }
let(:handler_a) { mock("Handler A") }
let(:handler_b) { mock("Handler B") }
it "finds the image handler for an image" do
handler_a.expects(:can_render? => true)
image_handler.register(handler_a)
image_handler.register(handler_b)
handler = image_handler.find("arbitrary blob")
handler.should == handler_a
end
it "can prepend handlers" do
handler_b.expects(:can_render? => true)
image_handler.register(handler_a)
image_handler.register!(handler_b)
handler = image_handler.find("arbitrary blob")
handler.should == handler_b
end
it "can unregister a handler" do
handler_b.expects(:can_render? => true)
image_handler.register(handler_a)
image_handler.register(handler_b)
image_handler.unregister(handler_a)
handler = image_handler.find('arbitrary blob')
handler.should == handler_b
end
it "raises an error when no matching handler is found" do
handler_a.expects(:can_render? => false)
handler_b.expects(:can_render? => 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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