* tests focus on the contract that implementations should honour and the
 * interaction with {@link SmbFile} instances. The tests make heavy use of
 * Mockito to guarantee that implementation classes do not inadvertently
 * bypass the filter logic.
 */
public class SmbFileFilterTest {

    /**
     * A minimal implementation that accepts every {@link SmbFile}.
     */
    private final SmbFileFilter ALWAYSACTIVE = new SmbFileFilter() {

        when(smbFile.length()).thenReturn(-1L);
        assertFalse(filter.accept(smbFile), "Negative size should be rejected");
        verify(smbFile, times(1)).length();

        // zero size -> reject
        reset(smbFile);
        when(smbFile.length()).thenReturn(0L);
        assertFalse(filter.accept(smbFile), "Zero size should be rejected");
        verify(smbFile, times(1)).length();

        responseData.setUrl(filePath);

        SmbFile file = null;
        final SmbAuthentication smbAuthentication = smbAuthenticationHolder.get(filePath);
        if (logger.isDebugEnabled()) {
            logger.debug("Creating SmbFile: {} - {}", filePath, smbAuthentication);
        }
        try {
            if (smbAuthentication == null) {
                file = new SmbFile(filePath, cifsContext);
            } else {

        // fileAttributes
        fileAttributes = 0;

        // openFunction
        if ((flags & SmbFile.O_TRUNC) == SmbFile.O_TRUNC) {
            // truncate the file
            if ((flags & SmbFile.O_CREAT) == SmbFile.O_CREAT) {
                // create it if necessary
                openFunction = OPEN_FN_TRUNC | OPEN_FN_CREATE;
            } else {

     */
    public SmbRandomAccessFile(final SmbFile file, final String mode) throws SmbException, MalformedURLException, UnknownHostException {
        this.file = file;
        if (mode.equals("r")) {
            this.openFlags = SmbFile.O_CREAT | SmbFile.O_RDONLY;
        } else if (mode.equals("rw")) {
            this.openFlags = SmbFile.O_CREAT | SmbFile.O_RDWR | SmbFile.O_APPEND;

        // Test get(String url) method
        String url = "smb://server/share/file.txt";
        SmbResource mockSmbResource = mock(SmbFile.class);
        // Mocking SmbFile constructor is tricky, so we'll just verify the call to the delegate
        // and ensure no exception is thrown for a valid URL.
        // The actual SmbFile creation is outside the scope of this wrapper's direct responsibility.

### Basic Usage

```java
import jcifs.CIFSContext;
import jcifs.context.SingletonContext;
import jcifs.smb.SmbFile;

// Using default context
CIFSContext context = SingletonContext.getInstance();

// Access a file (encryption is transparent - automatically used if server requires it)
try (SmbFile file = new SmbFile("smb://server/share/file.txt", context)) {
    if (file.exists()) {

class ShareEnumIteratorTest {

    @Mock
    ResourceFilter filter;

    // Helper to create a parent SmbFile that does not hit the network for simple operations
    private SmbFile newParent() throws MalformedURLException {
        // Valid share URL with trailing slash; constructing does not perform I/O
        return new SmbFile("smb://test-server/share/");
    }

    // Helper to create a minimal FileEntry mock

        assertEquals(SmbFile.TYPE_PRINTER, hiddenPrinter.getType());
    }

    /**
     * Test of getAttributes method, of class SmbShareInfo.
     */
    @Test
    void testGetAttributes() {
        SmbShareInfo instance = new SmbShareInfo();
        int expResult = SmbFile.ATTR_READONLY | SmbFile.ATTR_DIRECTORY;
        int result = instance.getAttributes();
        assertEquals(expResult, result);
    }

            String url = "smb1://user:pass@server/share/file.txt";
            SmbFile smbFile = new SmbFile(url, mockAuth);
            assertNotNull(smbFile);
            assertEquals(mockAuth, smbFile.getPrincipal());
            assertEquals("server", smbFile.getServer());
            assertEquals("share", smbFile.getShare());
        }

        @Test
        public void testConstructorWithMalformedUrl() {