Check out Test::Output and Test::Output::Tie.

Nope. These are for testing things that output to STDERR (and other filehandles), not for capturing the STDERR output from test scripts :-)

For the latter look at analyze() from Test::Harness::Straps and use some kind of IPC3/Run3 variant to capture STDERR. See Quiet test runner for an example.

In reply to Re^2: Capturing stderr from a test script executed by Test::Harness::Straps by adrianh
in thread Capturing stderr from a test script executed by Test::Harness::Straps by DrWhy

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