private static void assertHumanReadable(String output) {
        String dataRow = output.split("\n")[1];
        String lastFetchTimestamp = dataRow.split("\t")[3];
        String lastFetchTimestampValue = lastFetchTimestamp.split(" ")[0];
        String lastCaughtUpTimestamp = dataRow.split("\t")[4];
        String lastCaughtUpTimestampValue = lastCaughtUpTimestamp.split(" ")[0];
        assertTrue(lastFetchTimestamp.contains("ms ago"));
        assertTrue(lastFetchTimestampValue.matches("\\d*"));
        assertTrue(lastCaughtUpTimestamp.contains("ms ago"));
        assertTrue(lastCaughtUpTimestampValue.matches("\\d*"));
    }
1. The same number of broker controllers
2. More brokers than controllers
3. Fewer brokers than controllers
tools/src/test/java/org/apache/kafka/tools/MetadataQuorumCommandTest.java