assertThrows(
                TransferCancelledException.class,
                () -> listener.transferStarted(event(session, resource, TransferEvent.EventType.STARTED)));
    }

    @Test
    void handlesAbsentTransferSource() throws InterruptedException, TransferCancelledException {
        TransferResource resource = new TransferResource(null, null, "http://maven.org/test/test-resource", null, null);