go/doc/next/6-stdlib/1-synctest.md

### New testing/synctest package

<!-- go.dev/issue/67434, go.dev/issue/73567 -->
The new [testing/synctest](/pkg/testing/synctest) package
provides support for testing concurrent code.

The [synctest.Test] function runs a test function in an isolated
"bubble". Within the bubble, [time](/pkg/time) package functions
operate on a fake clock.

The [synctest.Wait] function waits for all goroutines in the
current bubble to block.
testing/synctest: add Test Add a synctest.Test function, superseding the experimental synctest.Run function. Promote the testing/synctest package out of experimental status. For #67434 For #73567 Change-Id: I3c5ba030860d90fe2ddb517a2f3536efd60181a9 Reviewed-on: https://go-review.googlesource.com/c/go/+/671961 Auto-Submit: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> 2025-05-12 11:15:08 -07:00			`### New testing/synctest package`

doc/next: add crudely processed todos This is the output of relnote -goroot=... todo, with each todo in a comment, followed by summary text from the issue and perhaps the CL, lightly processed into markdown. For #71661. Change-Id: I855c4c4ee02491b5b6113822baf69dbafb4e54ab Reviewed-on: https://go-review.googlesource.com/c/go/+/675877 Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> 2025-05-23 14:49:13 -04:00			`<!-- go.dev/issue/67434, go.dev/issue/73567 -->`
testing/synctest: add Test Add a synctest.Test function, superseding the experimental synctest.Run function. Promote the testing/synctest package out of experimental status. For #67434 For #73567 Change-Id: I3c5ba030860d90fe2ddb517a2f3536efd60181a9 Reviewed-on: https://go-review.googlesource.com/c/go/+/671961 Auto-Submit: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> 2025-05-12 11:15:08 -07:00			`The new [testing/synctest](/pkg/testing/synctest) package`
			`provides support for testing concurrent code.`

			`The [synctest.Test] function runs a test function in an isolated`
			`"bubble". Within the bubble, [time](/pkg/time) package functions`
			`operate on a fake clock.`

			`The [synctest.Wait] function waits for all goroutines in the`
			`current bubble to block.`