protobuf_negative_enums.rb

require 'protobuf'

class SampleEnum < ::Protobuf::Enum
  define :NEGATIVE, -1
  define :ZERO, 0
  define :POSITIVE, 1
end

class SampleMessage < ::Protobuf::Message
  required SampleEnum, :my_enum, 1
end

def roundtrip(msg)
  begin
    encoded_msg = msg.encode
    decoded_msg = SampleMessage.decode(encoded_msg)
    puts "Successful round trip"
  rescue StandardError => e
    puts "Failed round trip: #{e.message}, #{e.backtrace}"
  end
end

if __FILE__ == $0
  puts "About to round trip a message with an enum with a positive value:"
  roundtrip(SampleMessage.new(:my_enum => SampleEnum::POSITIVE))

  puts "About to round trip a message with an enum with a zero value:"
  roundtrip(SampleMessage.new(:my_enum => SampleEnum::ZERO))

  puts "About to round trip a message with an enum with a negative value:"
  roundtrip(SampleMessage.new(:my_enum => SampleEnum::NEGATIVE))
end