add_message "basic_test.TestMessage" do
      optional :optional_int32, :int32, 1
      optional :optional_int64, :int64, 2
      optional :optional_uint32, :uint32, 3
      optional :optional_uint64, :uint64, 4
      optional :optional_bool, :bool, 5
      optional :optional_float, :float, 6
      optional :optional_double, :double, 7
      optional :optional_string, :string, 8
      optional :optional_bytes, :bytes, 9
      optional :optional_msg, :message, 10, "basic_test.TestMessage2"
      optional :optional_enum, :enum, 11, "basic_test.TestEnum"
      repeated :repeated_int32, :int32, 12, packed: true
      repeated :repeated_int64, :int64, 13, packed: true
      repeated :repeated_uint32, :uint32, 14, packed: true
      repeated :repeated_uint64, :uint64, 15, packed: true
      repeated :repeated_bool, :bool, 16, packed: true
      repeated :repeated_float, :float, 17, packed: true
      repeated :repeated_double, :double, 18, packed: true
      repeated :repeated_string, :string, 19
      repeated :repeated_bytes, :bytes, 20
      repeated :repeated_msg, :message, 21, "basic_test.TestMessage2"
      repeated :repeated_enum, :enum, 22, "basic_test.TestEnum", packed: true
    end