tee: add short-read regression test#11784
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Upstream commit 9f50c8b ("tee: fix input with sleep") already contains the functional fix for short reads from a paused writer. Keep the regression coverage so we do not reintroduce the bug. The test writes one small chunk, waits long enough for a buggy tee to exit, then writes a second chunk and asserts both stdout and the output file receive both writes.
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Upstream commit 9f50c8b ("tee: fix input with sleep") already contains the functional fix for short reads from a paused writer. Keep the regression coverage so we do not reintroduce the bug.
The test writes one small chunk, waits long enough for a buggy tee to exit, then writes a second chunk and asserts both stdout and the output file receive both writes.