assertEquals(12345, tid, "Should return the configured tree ID");
            verify(mockResponse).getTid();
        }

        @Test
        @DisplayName("Should return service type")
        void testGetService() {
            // Given
            when(mockResponse.getService()).thenReturn("A:");

            // When
            String service = mockResponse.getService();

            // Then

        // Test zero TID (valid)
        setTreeIdMethod.invoke(response, 0);
        assertTrue(response.isValidTid());
    }

    @Test
    @DisplayName("Should return null for getService")
    void testGetService() {
        // When
        String service = response.getService();

        // Then
        assertNull(service);
    }

    @Test