51c0bdc6d1
While debugging #40771, I realized that the chatty printer should only ever print to a single io.Writer (normally os.Stdout). The other Writer implementations in the chain write to local buffers, but if we wrote a test's output to a local buffer, then we did *not* write it to stdout and we should not store it as the most recently logged test. Because the chatty printer should only ever print to one place, it shouldn't receive an io.Writer as an argument — rather, it shouldn't be used at all for destinations other than the main output stream. On the other hand, when we flush the output buffer to stdout in the top-level flushToParent call, it is important that we not allow some other test's output to intrude between the test summary header and the remainder of the test's output. cmd/test2json doesn't know how to parse such an intrusion, and it's confusing to humans too. No test because I couldn't reproduce the user-reported error without modifying the testing package. (This behavior seems to be very sensitive to output size and/or goroutine scheduling.) Fixes #40771 Updates #38458 Change-Id: Ic19bf1d535672b096ba1c8583a3b74aab6d6d766 Reviewed-on: https://go-review.googlesource.com/c/go/+/249026 Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jay Conrod <jayconrod@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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