docs: private String getCodeSnippetHtml(Throwable cause) {
          StringBuilder codeSnippet = new StringBuilder();
          BufferedReader reader = null;
          
          try {
              if (cause instanceof CitrusRuntimeException) {
                  CitrusRuntimeException ex = (CitrusRuntimeException) cause;
                  if (!ex.getFailureStack().isEmpty()) {
                      FailureStackElement stackElement = ex.getFailureStack().pop();
                      if (stackElement.getLineNumberStart() > 0) {
                          reader = new BufferedReader(new FileReader(
                                  new ClassPathResource(stackElement.getTestFilePath() + ".xml").getFile()));
                          
                          codeSnippet.append("<div class=\"code-snippet\">");
                          codeSnippet.append("<h2 class=\"code-title\">" + stackElement.getTestFilePath() + ".xml</h2>");
                          
                          String line;
                          String codeStyle;
                          int lineIndex = 1;
                          int snippetOffset = 5;
                          while ((line = reader.readLine()) != null) {
                              if (lineIndex >= stackElement.getLineNumberStart() - snippetOffset && 
                                      lineIndex < stackElement.getLineNumberStart() || 
                                      lineIndex > stackElement.getLineNumberEnd() && 
                                      lineIndex <= stackElement.getLineNumberEnd() + snippetOffset) {
                                  codeStyle = "code";
                              } else if (lineIndex >= stackElement.getLineNumberStart() && 
                                      lineIndex <= stackElement.getLineNumberEnd()) {
                                  codeStyle = "code-failed";
                              } else {
                                  codeStyle = "";
                              }
                              
                              if (StringUtils.hasText(codeStyle)) {
                                  codeSnippet.append("<pre class=\"" + codeStyle +"\"><span class=\"line-number\">" + lineIndex + ":</span>" + 
                                          line.replaceAll(">", "&gt;").replaceAll("<", "&lt;") + "</pre>");
                              }
                              
                              lineIndex++;
                              
                          }
                          
                          codeSnippet.append("</div>");
                      }
                  }
              }
          } catch (IOException e) {
              log.error("Failed to construct HTML code snippet", e);
          } finally {
              if (reader != null) {
                  try {
                      reader.close();
                  } catch (IOException e) {
                      log.warn("Failed to close test file", e);
                  }
              }
          }
          
          return codeSnippet.toString();
      }