verify(smbFileHandle, times(1)).isValid();
    }

    /**
     * Test isValid() when the handle is invalid.
     */
    @Test
    void testIsValid_whenInvalid() {
        when(smbFileHandle.isValid()).thenReturn(false);
        assertFalse(smbFileHandle.isValid(), "isValid should return false when the handle is invalid.");
        verify(smbFileHandle, times(1)).isValid();