cmd/dist: test all 'std cmd' packages, even ones without _test.go files

Remove the optimization added in CL 10492 that skips running 'go test'
on Go packages without _test.go files. By now, 'go test' can find real
problems even in packages that don't have any custom tests.

On my fairly fast laptop, running go test -short on all 164 normal
and 96 vendored packages without tests took around 10 seconds on
the first run and 2.5 seconds on the second, a small fraction of
the total all.bash time. So prioritize gains in the test coverage
over those savings in all.bash time.

Fixes golang/go#60463.

Change-Id: I3d2bec5c367de687e57131e7fd7e6b84fed30187
Reviewed-on: https://go-review.googlesource.com/c/go/+/503095
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/src/cmd/dist/test.go b/src/cmd/dist/test.go
index 554adea1b1..5a875ebf19 100644
--- a/src/cmd/dist/test.go
+++ b/src/cmd/dist/test.go
@@ -601,9 +601,16 @@ func (t *tester) registerTests() {
 			}
 		}
 	} else {
-		// Use a format string to only list packages and commands that have tests.
-		const format = "{{if (or .TestGoFiles .XTestGoFiles)}}{{.ImportPath}}{{end}}"
-		cmd := exec.Command(gorootBinGo, "list", "-f", format)
+		// Use 'go list std cmd' to get a list of all Go packages
+		// that running 'go test std cmd' could find problems in.
+		// (In race test mode, also set -tags=race.)
+		//
+		// This includes vendored packages and other packages without
+		// tests so that 'dist test' finds if any of them don't build,
+		// have a problem reported by high-confidence vet checks that
+		// come with 'go test', and anything else 'go test' may check
+		// in the future. See go.dev/issue/60463.
+		cmd := exec.Command(gorootBinGo, "list")
 		if t.race {
 			cmd.Args = append(cmd.Args, "-tags=race")
 		}