modify a comment

test/end2end_test.go

@@ -304,9 +304,10 @@ func setUp(useTLS bool, maxStream uint32) (s *grpc.Server, tc testpb.TestService
 func TestTimeoutOnDeadServer(t *testing.T) {
 	s, tc := setUp(false, math.MaxUint32)
 	s.Stop()
-	// Set a minimal deadline to make sure the context times out in the 1st
-	// invoke of ClientConn.wait.
-	ctx, _ := context.WithTimeout(context.Background(), time.Nanosecond)
+	// Set -1 as the timeout to make sure if transportMonitor gets error
+	// notification in time the failure path of the 1st invoke of
+	// ClientConn.wait hits the deadline exceeded error.
+	ctx, _ := context.WithTimeout(context.Background(), -1)
 	if _, err := tc.EmptyCall(ctx, &testpb.Empty{}); grpc.Code(err) != codes.DeadlineExceeded {
 		t.Fatalf("TestService/EmptyCall(%v, _) = _, error %v, want _, error code: %d", ctx, err, codes.DeadlineExceeded)
 	}