# Copyright, 2017, by Samuel G. D. Williams. <http://www.codeotaku.com>
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module Async
	module RSpec
		module Leaks
			def current_ios(gc: GC.start)
				all_ios = ObjectSpace.each_object(::IO).to_a.sort_by(&:object_id)
				
				# We are not interested in ios that have been closed already:
				return all_ios.reject{|io| io.closed?}
			end
		end
		
		RSpec.shared_context Leaks do
			include Leaks
			
			let(:before_ios) {current_ios}
			let(:after_ios) {current_ios}
			
			# We use around(:each) because it's the highest priority.
			around(:each) do |example|
				before_ios
				
				example.run.tap do
					expect(after_ios).to be == before_ios
				end
			end
		end
	end
end