1 files changed, 26 insertions, 0 deletions
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
index 1decebdc22..bf2f3da535 100644
--- a/src/os/exec/exec_test.go
+++ b/src/os/exec/exec_test.go
@@ -1839,3 +1839,29 @@ func TestAbsPathExec(t *testing.T) {
 		}
 	})
 }
+
+// Calling Start twice is an error, regardless of outcome.
+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)
+		}
+	}
+}
+
+func cond[T any](cond bool, t, f T) T {
+	if cond {
+		return t
+	} else {
+		return f
+	}
+}