verify(dest, times(2)).openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt());
    }

    @Test
    @DisplayName("openCopyTargetFile rethrows when not READONLY")
    void openCopyTargetFile_rethrowsWhenNotReadonly() throws Exception {
        // Arrange
        SmbFile dest = mock(SmbFile.class);
        SmbAuthException authEx = new SmbAuthException("denied");