assertNotNull(outputStream);
        assertTrue(outputStream instanceof ByteArrayOutputStream);
    }

    public void test_getXContentOutputStream_withException() {
        ToXContent xContent = new ToXContent() {
            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {

        String field = "content";

        List<String> results = converter.convert(text, field, "en", "ja");

        assertNotNull(results);
        // With multiple languages, should use ReadingConverterChain
    }

    @Test
    public void testConvertWithEmptyText() throws IOException {
        // Test convert with empty text
        String text = "";
        String field = "content";

import org.codelibs.fess.suggest.exception.SuggesterException;
import org.opensearch.action.get.GetResponse;
import org.opensearch.common.collect.Tuple;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.common.xcontent.json.JsonXContent;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.index.IndexNotFoundException;
import org.opensearch.transport.client.Client;

/**

        assertEquals("output", item.getOutput());
    }

    // Helper method to write content to test file
    private void writeTestFile(String content) throws IOException {
        Writer writer = null;
        try {
            writer = new OutputStreamWriter(new FileOutputStream(testFile), Constants.UTF_8);
            writer.write(content);
            writer.flush();
        } finally {

        Map<String, String> params = new HashMap<>();
        params.put("Content-Type", "text/plain");
        final ExtractData extractData = tikaExtractor.getText(in, params);
        final String content = extractData.getContent();
        CloseableUtil.closeQuietly(in);
        logger.info(content);
        assertTrue(content.contains("テスト"));
    }

    // TODO tika needs to support pdfbox 2.0
    //    public void test_getTika_pdf() {

    val expected =
      """
      |--AaB03x
      |Content-Disposition: form-data; name="submit-name"
      |
      |Larry
      |--AaB03x
      |Content-Disposition: form-data; name="files"
      |Content-Type: multipart/mixed; boundary=BbC04y
      |
      |--BbC04y
      |Content-Disposition: file; filename="file1.txt"
      |Content-Type: text/plain; charset=utf-8
      |

        String content;

        content = "...;charset=UTF-8\"...";
        assertEquals("UTF-8", htmlTransformer.parseCharset(content));

        content = "...; charset=UTF-8\"...";
        assertEquals("UTF-8", htmlTransformer.parseCharset(content));

        content = "...;charset = UTF-8\"...";
        assertEquals("UTF-8", htmlTransformer.parseCharset(content));

class MultipartReaderTest {
  @Test fun `parse multipart`() {
    val multipart =
      """
      |--simple boundary
      |Content-Type: text/plain; charset=utf-8
      |Content-ID: abc
      |
      |abcd
      |efgh
      |--simple boundary
      |Content-Type: text/plain; charset=utf-8
      |Content-ID: ijk
      |
      |ijkl
      |mnop
      |
      |--simple boundary--
      """.trimMargin()

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <link rel="icon" type="image/png" href="https://oss.sonatype.org/favicon.png">
    <!--[if IE]>
    <link rel="SHORTCUT ICON" href="https://oss.sonatype.org/favicon.ico"/>
    <![endif]-->

        Map<String, List<String>> headers = new HashMap<>();
        headers.put("Content-Type", Arrays.asList("application/json"));
        headers.put("Content-Length", Arrays.asList("100"));
        response.setHeaders(headers);

        String contentType = response.getHeaderValue("Content-Type");
        String contentLength = response.getHeaderValue("content-length"); // Test case insensitive