os/exec_test: fix test on Plan 9

Error strings vary across OSes when trying to execute a file
that does not exist. Since matching them is not the point of
the test, ignore them.

Fixes #76965

Change-Id: I6d220bc2d0289070f3441adb48983c13b2a3e597
Reviewed-on: https://go-review.googlesource.com/c/go/+/732940
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Richard Miller <millerresearch@gmail.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

1 files changed, 7 insertions, 17 deletions

diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
index bf2f3da535..2746ad8783 100644
--- a/src/os/exec/exec_test.go
+++ b/src/os/exec/exec_test.go
@@ -1845,23 +1845,13 @@ func TestStart_twice(t *testing.T) {
 	testenv.MustHaveExec(t)
 
 	cmd := exec.Command("/bin/nonesuch")
-	for i, want := range []string{
-		cond(runtime.GOOS == "windows",
-			`exec: "/bin/nonesuch": executable file not found in %PATH%`,
-			"fork/exec /bin/nonesuch: no such file or directory"),
-		"exec: already started",
-	} {
-		err := cmd.Start()
-		if got := fmt.Sprint(err); got != want {
-			t.Errorf("Start call #%d return err %q, want %q", i+1, got, want)
-		}
+	if err := cmd.Start(); err == nil {
+		t.Fatalf("running invalid command succeeded")
 	}
-}
-
-func cond[T any](cond bool, t, f T) T {
-	if cond {
-		return t
-	} else {
-		return f
+	err := cmd.Start()
+	got := fmt.Sprint(err)
+	want := "exec: already started"
+	if got != want {
+		t.Fatalf("Start call returned err %q, want %q", got, want)
 	}
 }