diff --git a/src/os/signal/signal_test.go b/src/os/signal/signal_test.go
index 3182e83b4e..086ecdbcd5 100644
--- a/src/os/signal/signal_test.go
+++ b/src/os/signal/signal_test.go
@@ -713,7 +713,7 @@ func TestNotifyContextNotifications(t *testing.T) {
 		}
 		wg.Wait()
 		<-ctx.Done()
-		fmt.Print("received SIGINT")
+		fmt.Println("received SIGINT")
 		// Sleep to give time to simultaneous signals to reach the process.
 		// These signals must be ignored given stop() is not called on this code.
 		// We want to guarantee a SIGINT doesn't cause a premature termination of the program.
@@ -730,11 +730,17 @@ func TestNotifyContextNotifications(t *testing.T) {
 		{"multiple", 10},
 	}
 	for _, tc := range testCases {
+		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
 			var subTimeout time.Duration
 			if deadline, ok := t.Deadline(); ok {
-				subTimeout := time.Until(deadline)
-				subTimeout -= subTimeout / 10 // Leave 10% headroom for cleaning up subprocess.
+				timeout := time.Until(deadline)
+				if timeout < 2*settleTime {
+					t.Fatalf("starting test with less than %v remaining", 2*settleTime)
+				}
+				subTimeout = timeout - (timeout / 10) // Leave 10% headroom for cleaning up subprocess.
 			}
 
 			args := []string{
@@ -750,7 +756,7 @@ func TestNotifyContextNotifications(t *testing.T) {
 			if err != nil {
 				t.Errorf("ran test with -check_notify_ctx_notification and it failed with %v.\nOutput:\n%s", err, out)
 			}
-			if want := []byte("received SIGINT"); !bytes.Contains(out, want) {
+			if want := []byte("received SIGINT\n"); !bytes.Contains(out, want) {
 				t.Errorf("got %q, wanted %q", out, want)
 			}
 		})