verify(tree).send(captor.capture(), any());
        assertNotNull(captor.getValue());
    }

    @Test
    @DisplayName("recv delegates to input.readDirect and returns its value")
    void testRecvDelegation() throws Exception {
        SmbPipeHandleImpl spyTarget = spy(target);
        SmbPipeInputStream in = mock(SmbPipeInputStream.class);
        doReturn(in).when(spyTarget).getInput();