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[tests] Better stderr testing
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Authored by Fabien on Jun 10 2019, 11:48.

Details

Summary
This PR tightens our checking of stderr and will cause tests to fail if
there is any unexpected message in stderr:

  - commit Write stdout/stderr to datadir instead of temp file writes
stderr to a file in the datadir instead of a temporary file. This helps
with debugging in the case of failure.
  - commit Use LIBC_FATAL_STDERR=1 in tests ensures that libc failures
are logged to stderr instead of the terminal.

Backport of core PR12755
https://github.com/bitcoin/bitcoin/pull/12755/files

Depends on D3273
Fixes T540

Test Plan
./test/functional/test_runner.py --extended

Diff Detail

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rABC Bitcoin ABC
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