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testing: clarify in docs that TestMain is advanced

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Beginner and intermediate Go users periodically use TestMain when
requirements do not necessitate TestMain (exceeding least-mechanism
design). This commit expands package testing's documentation to convey
that the TestMain feature itself is somewhat low-level and potentially
unsuitable for casual testing where ordinary test functions would
suffice.

Fixes #42161
Updates #44200

Change-Id: I91ba0b048c3d6f79110fe8f0fbb58d896edca366
Reviewed-on: https://go-review.googlesource.com/c/go/+/334649
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Matt T. Proud 2021-07-14 22:42:31 +02:00 committed by Ian Lance Taylor
parent 69728ead87
commit 0941dbca6a
1 changed files with 2 additions and 0 deletions
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2
src/testing/testing.go
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@ -233,6 +233,8 @@
// os.Exit(m.Run())
// }
//
// TestMain is a low-level primitive and should not be necessary for casual
// testing needs, where ordinary test functions suffice.
package testing
import (