Please review WriterTest (many issues)

https://github.com/apache/ozhera/blob/66402b2a2b33712fa060efe7aa2f254bb32922cb/trace-etl/trace-etl-server/src/test/java/com/xiaomi/youpin/trace/etl/test/WriterTest.java

* not in an org.apache package
* has an `@author` tag - this is not the Apache Way - code is owned by all contributors, noone should claim credit as the author
* the test has lots of System.outs - this is not usually regarded as a good idea
* not many asserts - really doesn't seem to test much
* lines that have just `;` -- leave them blank (eg line 117)