* @param uri the URI to preprocess
     * @return the preprocessed URI
     * @throws CrawlerSystemException if the URI is empty
     */
    protected String preprocessUri(final String uri) {
        if (StringUtil.isEmpty(uri)) {
            throw new CrawlerSystemException("The uri is empty.");
        }

        return uri;
    }

    /**
     * Returns the character set for the given SMB1 file.
     *

            }

            final Set<String> matchedLabelSet = labelTypeHelper.getMatchedLabelValueSet(url);
            if (!matchedLabelSet.isEmpty()) {
                final Set<String> newLabelSet = new HashSet<>();
                final String[] oldLabels = (String[]) dataMap.get(fessConfig.getIndexFieldLabel());
                if (oldLabels != null) {

    throw new UnsupportedOperationException();
  }

  @Override
  public final void clear() {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    return get(key) != null;
  }

  @Override

     * @param uri the URI to preprocess
     * @return the preprocessed URI
     * @throws CrawlerSystemException if the URI is empty
     */
    protected String preprocessUri(final String uri) {
        if (StringUtil.isEmpty(uri)) {
            throw new CrawlerSystemException("The uri is empty.");
        }

        return uri;
    }

    /**
     * Returns the character set for the given SMB file.
     *

        assertThat(UnsignedLongs.toString(xLong, base)).isEqualTo(xValue.toString(base));
      }
    }
  }

  public void testJoin() {
    assertThat(UnsignedLongs.join(",")).isEmpty();
    assertThat(UnsignedLongs.join(",", 1)).isEqualTo("1");
    assertThat(UnsignedLongs.join(",", 1, 2)).isEqualTo("1,2");
    assertThat(UnsignedLongs.join(",", -1, Long.MIN_VALUE))

/** Returns an immutable copy of this. */
@Suppress("UNCHECKED_CAST")
internal fun <T> List<T>.toImmutableList(): List<T> =
  when {
    this.isEmpty() -> emptyList()
    this.size == 1 -> Collections.singletonList(this[0])
    // Collection.toArray returns Object[] (covariant).
    // It is faster than creating real T[] via reflection (Arrays.copyOf).

        assertEquals("fess_suggest", testBuilder.settingsIndexName);
        assertNotNull(testBuilder.timeoutSettings);
        assertNotNull(testBuilder.initialSettings);
        assertTrue(testBuilder.initialSettings.isEmpty());
    }

    @Test
    public void testSetSettingsIndexName() {
        // Test setting index name with lowercase conversion
        SuggestSettingsBuilder result = builder.setSettingsIndexName("TEST_INDEX");

        return false;
    }

    @Override
    public boolean isAvailable() {
        if (available != null) {
            return available;
        }
        if (generatorList != null && !generatorList.isEmpty()) {
            String path = System.getenv("PATH");
            if (path == null) {
                path = System.getenv("Path");
            }
            if (path == null) {

    }

    public void test_getRunningSessionIdSet_empty() {
        Set<String> sessionIds = processHelper.getRunningSessionIdSet();
        assertNotNull(sessionIds);
        assertTrue(sessionIds.isEmpty());
    }

    public void test_destroyProcess_nonExistent() {
        int result = processHelper.destroyProcess("nonexistent");
        assertEquals(-1, result);
    }

        List<FileNotifyInformation> result = sut.watch();

        assertSame(info, result, "Should return same list instance");
        verify(info, times(1)).clear();
        assertTrue(result.isEmpty(), "List should be cleared");
    }

    // Parameterized test to exercise SMB2 with different recursive and filter values
    @ParameterizedTest(name = "SMB2 param: recursive={0}, filter={1}")