checkNotNull(separator);
    if (array.length == 0) {
      return "";
    }

    // For pre-sizing a builder, just get the right order of magnitude
    StringBuilder builder = new StringBuilder(array.length * 7);
    builder.append(array[0]);
    for (int i = 1; i < array.length; i++) {
      builder.append(separator).append(array[i]);
    }
    return builder.toString();
  }

        assertEquals("", result3);
    }

    @Test
    public void test_execute_performanceWithLargeErrorMessage() {
        // Test with very large error message
        final StringBuilder largeMessage = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            largeMessage.append("Error detail ").append(i).append(" ");
        }

        SearchLogHelper mockSearchLogHelper = new SearchLogHelper() {

        assertEquals(bytesWritten, bytesRead);
    }

    @Test
    @DisplayName("Test with very long filename")
    void testWithVeryLongFilename() {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 100; i++) {
            sb.append("longname");
        }
        String longFileName = sb.toString() + ".txt";

        return this;
    }

    public boolean isResolveTransitively() {
        return resolveTransitively;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder()
                .append("REQUEST: ")
                .append(LS)
                .append("artifact: ")
                .append(artifact)
                .append(LS)

        if (l == null) {
            return new ArrayList<>();
        }
        return l;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();

        if (artifacts != null) {
            int i = 1;
            sb.append("---------").append(LS);
            sb.append(artifacts.size()).append(LS);

        assertTrue(result.contains("<strong>太字</strong>"));
        assertTrue(result.contains("斜体"));
    }

    @Test
    public void test_render_longContent() {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 100; i++) {
            sb.append("Paragraph ").append(i).append("\n\n");
        }
        String result = markdownRenderer.render(sb.toString());

            final boolean useReading) {
        final List<AnalyzeToken> tokens = new ArrayList<>();
        final StringBuilder buf = new StringBuilder(maxAnalyzedContentLength);
        final String analyzeType = useReading ? "reading " : "";

        for (final String t : text.split("\\s")) {
            buf.append(t).append(' ');

        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withLongMessage() {
        // Test with long message
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            sb.append("Long message content ");
        }
        String longMessage = sb.toString();

        String result = languageHelper.getDetectText(text);
        assertEquals("Short text", result);
    }

    @Test
    public void test_getDetectText_longText() {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 1100; i++) {
            sb.append("a");
        }
        String longText = sb.toString();

        String result = languageHelper.getDetectText(longText);

        execJob.testDeleteTempDir(nonExistentDir);
    }

    // Test appendJarFile method
    @Test
    public void test_appendJarFile() throws IOException {
        StringBuilder buf = new StringBuilder();
        File libDir = new File(tempDir, "lib");
        assertTrue(libDir.mkdir());

        // Create test jar files
        File jar1 = new File(libDir, "test1.jar");