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cmd/go, testing: add TB.ArtifactDir and -artifacts flag

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Add TB.ArtifactDir, which returns a directory for a test to store
output files in. Add a -artifacts testflag which enables persistent
storage of artifacts in the output directory (-outputdir, or the
current directory by default).

Fixes #71287

Change-Id: I5f6515a6cd6c103f88588f4c033d5ea11ffd0c3c
Reviewed-on: https://go-review.googlesource.com/c/go/+/696399
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Damien Neil 2025-08-15 15:24:05 -07:00
parent 1623927730
commit bb1ca7ae81
11 changed files with 333 additions and 71 deletions
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18
doc/next/6-stdlib/99-minor/testing/71287.md Normal file
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The new methods [T.ArtifactDir], [B.ArtifactDir], and [F.ArtifactDir]
return a directory in which to write test output files (artifacts).
When the `-artifacts` flag is provided to `go test`,
this directory will be located under the output directory
(specified with `-outputdir`, or the current directory by default).
Otherwise, artifacts are stored in a temporary directory
which is removed after the test completes.
The first call to `ArtifactDir` when `-artifacts` is provided
writes the location of the directory to the test log.
For example, in a test named `TestArtifacts`,
`t.ArtifactDir()` emits:
```
=== ARTIFACTS Test /path/to/artifact/dir
```