assertTrue(result.contains("2021") || result.contains("Jan") || result.contains("1609459200000"));
    }

    // Test appendTimestamp method
    @Test
    public void test_appendTimestamp() {
        StringBuilder buf = new StringBuilder();

        monitorTarget.appendTimestamp(buf);
        String result = buf.toString();
        assertTrue(result.startsWith("\"timestamp\":\""));

            case "append":
                if (method.getParameterCount() == 3) {
                    appendMethod = method;
                }
                break;
            case "appendTimestamp":
                appendTimestampMethod = method;
                break;
            case "appendException":
                appendExceptionMethod = method;
                break;
            }
        }