[RFC] test: Clean test_bitcoin-qt output #222

1. 
   hebasto commented at 8:52 pm on February 23, 2021: member

   All of expected QDEBUG : ... and QINFO : ... messages could be silenced with QTest::ignoreMessage. It will improve test_bitcoin-qt output quality.

   But some cases require QRegularExpression which is unavailable since https://github.com/bitcoin/bitcoin/pull/16386.

   Is it worth to drop -no-feature-regularexpression for such a use case?

2. 
   hebasto commented at 8:53 pm on February 23, 2021: member

   cc @fanquake @luke-jr @practicalswift
3. hebasto added the label Brainstorming on Mar 4, 2021
4. hebasto added the label Tests on Mar 5, 2021

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