final String[] dates = extractData.getValues("frontmatter.date");
        assertNotNull(dates);
        assertEquals("2025-01-15", dates[0]);
    }

    public void test_headingExtraction() {
        final InputStream in = ResourceUtil.getResourceAsStream("extractor/markdown/test.md");
        final ExtractData extractData = markdownExtractor.getText(in, null);
        CloseableUtil.closeQuietly(in);