add UT for org.apache.seata.spring.util package

[slievrly]

https://app.codecov.io/gh/apache/incubator-seata/tree/2.x/spring%2Fsrc%2Fmain%2Fjava%2Forg%2Fapache%2Fseata%2Fspring%2Futil

[Oscarcheng0312]

Hi , I’m Junqi. I’d like to work on this issue to get familiar with Seata’s development process. Could you please assign it to me. Thank you!

[slievrly]

@Oscarcheng0312 Looking forward to your PR.