// Assert
        assertFalse(result);
        verify(negotiationResponse).isValid(cifsContext, negotiationRequest);
    }

    @Test
    @DisplayName("Test isValid with null context")
    void testIsValidWithNullContext() {
        // Arrange
        when(negotiationResponse.isValid(null, negotiationRequest)).thenReturn(false);

        // Act
        boolean result = negotiationResponse.isValid(null, negotiationRequest);