[PR] test: expand CSV rendering helper coverage [rocketmq-dashboard]

["yyqdbngt (via GitHub)" <gi...@apache.org>]

yyqdbngt opened a new pull request, #3914:
URL: https://github.com/apache/rocketmq-dashboard/pull/3914

   ### Motivation
   
   The `CsvUtil` tests covered quote escaping and two formula prefixes, but the remaining leading formula characters (`-`, `@`, tab, CR/LF) and the empty-row append behavior were unasserted.
   
   ### Changes
   
   - Every leading formula character is neutralized with a protection apostrophe, including negative numbers (`-5`) and whitespace-led values.
   - `appendRow` joins multiple cells with commas and writes a bare CRLF row for an empty value list.
   
   ### Verification
   
   - `mvn -B test -Dtest=CsvUtilTest`: 4/4 passed, BUILD SUCCESS


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Re: [PR] test: expand CSV rendering helper coverage [rocketmq-dashboard]

["lizhimins (via GitHub)" <gi...@apache.org>]

lizhimins closed pull request #3914: test: expand CSV rendering helper coverage
URL: https://github.com/apache/rocketmq-dashboard/pull/3914


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