test: fix flaky test-stdout-buffer-flush-on-exit
- The test failed due to buffer limitations. This patch makes sure we are within the buffer limitations and still tests the buffer being flush on exit.
Fixes: #13638 (closed)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines