private static AdminClientUnitTestEnv mockClientEnv(Time time, String... configVals) {
        return new AdminClientUnitTestEnv(time, mockCluster(3, 0), configVals);
    }
A unit test for KafkaAdminClient.

See AdminClientIntegrationTest for an integration test.
clients/src/test/java/org/apache/kafka/clients/admin/KafkaAdminClientTest.java