[ISSUE#4535] Add unit test for RocketMQSourceConnector.

[yanrongzhen]

Fixes #4535 .

Modifications

Add unit test for RocketMQSourceConnector.

[codecov]

Codecov Report

Merging #4546 (3bcf8e6) into master (7438a55) will increase coverage by 0.15%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head 3bcf8e6 differs from pull request most recent head 78659be. Consider uploading reports for the commit 78659be to get more accurate results

@@             Coverage Diff              @@
##             master    #4546      +/-   ##
============================================
+ Coverage     16.14%   16.30%   +0.15%     
- Complexity     1581     1592      +11     
============================================
  Files           747      747              
  Lines         28965    28965              
  Branches       2541     2541              
============================================
+ Hits           4677     4723      +46     
+ Misses        23840    23793      -47     
- Partials        448      449       +1     

see 3 files with indirect coverage changes

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