assertEquals(response, result);
        verify(request, times(1)).initResponse(null);
    }

    @Test
    @DisplayName("Test getResponse returns the response message")
    void testGetResponse() {
        // Given
        when(request.getResponse()).thenReturn(response);

        // When
        CommonServerMessageBlockResponse result = request.getResponse();

        // Then

        // Verify multiple calls return the same instance
        assertSame(request, negotiation.getRequest());
    }

    @Test
    @DisplayName("getResponse should return the same response instance")
    void testGetResponse() {
        // Verify getResponse returns the exact same instance
        SmbNegotiationResponse response = negotiation.getResponse();
        assertSame(mockResponse, response);

        }
    }

    @Nested
    @DisplayName("Response Tests")
    class ResponseTests {

        @Test
        @DisplayName("Should return null response by default")
        void testGetResponse() {
            assertNull(testMessage.getResponse());
        }

        @Test
        @DisplayName("Should accept response setting")
        void testSetResponse() {