@Test
    public void testCommandConfig() throws IOException {
        // specifying a --command-config containing properties that would prevent login must fail
        File tmpfile = TestUtils.tempFile(AdminClientConfig.SECURITY_PROTOCOL_CONFIG + "=SSL_PLAINTEXT");
        assertEquals(1, MetadataQuorumCommand.mainNoExit("--bootstrap-server", "localhost:9092",
                        "--command-config", tmpfile.getAbsolutePath(), "describe", "--status"));
    }
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