assertEquals("login failed", ex.getMessage());
        verify(tree).connectLogon(context);
    }

    @Test
    @DisplayName("send without params returns the stubbed response")
    void send_noParams_returnsResponse() throws Exception {
        // Arrange - generic return type respected
        when(tree.send(request)).thenReturn(response);

        // Act
        CommonServerMessageBlockResponse out = tree.send(request);