@Execute
    public JsonResponse<ApiResult> docs(final SearchBody body) {
        validateApi(body, messages -> {});

        if (StringUtil.isBlank(body.q)) {
            // query matches on all documents.
            body.q = Constants.MATCHES_ALL_QUERY;
        }

        final SearchRenderData renderData = new SearchRenderData();
        body.initialize();
        try {

    //                                                                        Small Helper
    //                                                                        ============
    /**
     * Verifies that the CRUD mode matches the expected mode.
     *
     * @param crudMode the actual CRUD mode
     * @param expectedMode the expected CRUD mode
     */
    protected void verifyCrudMode(final int crudMode, final int expectedMode) {

        parser.parse(new InputSource(is));
        Node node = parser.getDocument().getFirstChild().getLastChild().getFirstChild();
        return tag.matches(node);
    }

    public void test_normalizeQueryLanguages() {
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override

        // Act & Assert
        // Due to implementation, iteration uses this.b.length and ignores extra bytes in argument
        assertTrue(shorter.equals(longer), "Shorter equals longer when prefix matches (implementation behavior)");

        // In the opposite direction, an out-of-bounds occurs internally and is caught as false
        assertFalse(longer.equals(shorter), "Longer does not equal shorter (implementation behavior)");

    String moreLines = "(?:.*" + System.lineSeparator() + "?)*";
    String expected =
        firstLine + System.lineSeparator() + secondLine + System.lineSeparator() + moreLines;
    assertThat(getStackTraceAsString(e)).matches(expected);
  }

  public void testGetCausalChain() {
    SomeUncheckedException sue = new SomeUncheckedException();
    IllegalArgumentException iae = new IllegalArgumentException(sue);

    // TODO(dbeaumont): Support escapers where alphanumeric chars are not safe.
    checkNotNull(safeChars); // eager for GWT.
    // Avoid any misunderstandings about the behavior of this escaper
    if (safeChars.matches(".*[0-9A-Za-z].*")) {
      throw new IllegalArgumentException(
          "Alphanumeric characters are always 'safe' and should not be explicitly specified");
    }

                assertNotNull(result);
                assertEquals(1, result.size());
                assertNotNull(result.get(0).getFileName());
                assertTrue(result.get(0).getFileName().matches("file[1-3]\\.txt"));
            }
        } finally {
            executor.shutdown();
        }
    }

    /**
     * Test watch timeout scenario
     */
    @Test

  private static void checkTryParse(String input) {
    Double expected = referenceTryParse(input);
    assertThat(Doubles.tryParse(input)).isEqualTo(expected);
    if (expected != null && !Doubles.FLOATING_POINT_PATTERN.matcher(input).matches()) {
      // TODO(cpovirk): Use SourceCodeEscapers if it is added to Guava.
      StringBuilder escapedInput = new StringBuilder();
      for (char c : input.toCharArray()) {
        if (c >= 0x20 && c <= 0x7E) {

        assertTrue(log.contains(", heap "));
        assertTrue(log.contains(", max "));
        assertTrue(log.endsWith("}"));

        // Verify format contains expected memory units
        assertTrue(log.matches(".*used [0-9.]+[a-zA-Z]+, heap [0-9.]+[a-zA-Z]+, max [0-9.]+[a-zA-Z]+.*"));
    }

    public void test_byteCountToDisplaySize_edgeCases() {

import java.util.Collections;
import java.util.Set;
import org.jspecify.annotations.Nullable;

/**
 * CompactLinkedHashSet is an implementation of a Set, which a predictable iteration order that
 * matches the insertion order. All optional operations (adding and removing) are supported. All
 * elements, including {@code null}, are permitted.
 *