@Test public void testProtocolMetadataOrder() { RoundRobinAssignor roundRobin = new RoundRobinAssignor(); RangeAssignor range = new RangeAssignor(); try (Metrics metrics = new Metrics(time)) { ConsumerCoordinator coordinator = buildCoordinator(metrics, Arrays.<PartitionAssignor>asList(roundRobin, range), ConsumerConfig.DEFAULT_EXCLUDE_INTERNAL_TOPICS, false, true); List<ProtocolMetadata> metadata = coordinator.metadata(); assertEquals(2, metadata.size()); assertEquals(roundRobin.name(), metadata.get(0).name()); assertEquals(range.name(), metadata.get(1).name()); } try (Metrics metrics = new Metrics(time)) { ConsumerCoordinator coordinator = buildCoordinator(metrics, Arrays.<PartitionAssignor>asList(range, roundRobin), ConsumerConfig.DEFAULT_EXCLUDE_INTERNAL_TOPICS, false, true); List<ProtocolMetadata> metadata = coordinator.metadata(); assertEquals(2, metadata.size()); assertEquals(range.name(), metadata.get(0).name()); assertEquals(roundRobin.name(), metadata.get(1).name()); } }