private static Sub sub(int s, int x) {
        return new Sub(s, new SubSub(x));
    }
Read in (deserialize) a thrift message in TTextProtocol format
from a file on disk, then serialize it back out to a string.
Finally, deserialize that string and compare to the original
message.
thrift/thrift0.13/src/test/java/com/linecorp/armeria/common/thrift/text/TTextProtocolTest.java