ContentTransformer transformer = new ContentTransformer("workflowTransformer");
        transformer.addTransformationRule("<[^>]+>", ""); // Remove HTML tags
        transformer.addTransformationRule("\\s+", " "); // Normalize whitespace

        // Simulate crawling response
        ResponseData responseData = new ResponseData();
        responseData.setUrl("http://example.com/page.html");
        responseData.setParentUrl("http://example.com/");

        assertNotNull(lmhosts.getByName("HOST4", mockContext));
    }

    @Test
    void testPopulateWithWhitespace() throws Exception {
        // Create a temporary lmhosts file with various whitespace
        File lmhostsFile = tempDir.resolve("lmhosts_whitespace").toFile();
        try (FileWriter writer = new FileWriter(lmhostsFile)) {
            writer.write("192.168.1.100    HOST1    \n");

      }
    }
  }

  /**
   * Reads the first line from a file. The line does not include line-termination characters, but
   * does include other leading and trailing whitespace.
   *
   * @param file the file to read from
   * @param charset the charset used to decode the input stream; see {@link StandardCharsets} for
   *     helpful predefined constants

        assertNotNull(result);
        assertEquals(1, result.size());
        assertEquals("", result.get(0));
    }

    @Test
    public void testGetAsListWithWhitespaceString() {
        // Test with whitespace string
        List<String> result = SuggestUtil.getAsList("   ");
        assertNotNull(result);
        assertEquals(1, result.size());
        assertEquals("   ", result.get(0));
    }

    @Test

 *
 * ### Percent encoding
 *
 * Percent encoding replaces a character (like `\ud83c\udf69`) with its UTF-8 hex bytes (like
 * `%F0%9F%8D%A9`). This approach works for whitespace characters, control characters, non-ASCII
 * characters, and characters that already have another meaning in a particular context.
 *
 * Percent encoding is used in every URL component except for the hostname. But the set of

   * throwing an exception if parsing fails. Valid inputs are exactly those accepted by {@link
   * Float#valueOf(String)}, except that leading and trailing whitespace is not permitted.
   *
   * <p>This implementation is likely to be faster than {@code Float.parseFloat} if many failures
   * are expected.
   *
   * @param string the string representation of a {@code float} value

   * throwing an exception if parsing fails. Valid inputs are exactly those accepted by {@link
   * Double#valueOf(String)}, except that leading and trailing whitespace is not permitted.
   *
   * <p>This implementation is likely to be faster than {@code Double.parseDouble} if many failures
   * are expected.
   *
   * @param string the string representation of a {@code double} value

    assertInvalid("http://$host/", "Invalid URL host: \"host\u0001\"")
    // TODO make exception message escape non-printable characters
  }

  @Test
  fun parseDoesNotTrimOtherWhitespaceCharacters() {
    // Whitespace characters list from Google's Guava team: http://goo.gl/IcR9RD
    // line tabulation
    assertThat(parse("http://h/\u000b").encodedPath).isEqualTo("/%0B")
    // information separator 4

- Kubeadm: tolerate whitespace when validating certificate authority PEM data in kubeconfig files ([#86705](https://github.com/kubernetes/kubernetes/pull/86705), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

- Kube-apiserver: Previously persisted `CustomResourceDefinition` objects with an invalid whitespace-only `caBundle` could serve requests that did not require conversion. ([#132514](https://github.com/kubernetes/kubernetes/pull/132514), [@tiffanny29631](https://github.com/tiffanny29631))