jeffkbkim commented on code in PR #13870:
URL: https://github.com/apache/kafka/pull/13870#discussion_r1259030830
##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupCoordinatorServiceTest.java:
##########
@@ -271,4 +289,110 @@ public void testOnResignation() {
10
);
}
+
+ @Test
+ public void testJoinGroup() {
+ CoordinatorRuntime<ReplicatedGroupCoordinator, Record> runtime =
mockRuntime();
+ GroupCoordinatorService service = new GroupCoordinatorService(
+ new LogContext(),
+ createConfig(),
+ runtime
+ );
+
+ JoinGroupRequestData request = new JoinGroupRequestData()
+ .setGroupId("foo");
+
+ service.startup(() -> 1);
+
+ when(runtime.scheduleWriteOperation(
+ ArgumentMatchers.eq("generic-group-join"),
+ ArgumentMatchers.eq(new TopicPartition("__consumer_offsets", 0)),
+ ArgumentMatchers.any()
+ )).thenReturn(CompletableFuture.completedFuture(
+ new JoinGroupResponseData()
+ ));
+
+ CompletableFuture<JoinGroupResponseData> responseFuture =
service.joinGroup(
+ requestContext(ApiKeys.JOIN_GROUP),
+ request,
+ BufferSupplier.NO_CACHING
+ );
+
+ assertFalse(responseFuture.isDone());
Review Comment:
A successful join group request will store the response future into the
member's `awaitingJoinFuture` (could also complete if the join phase completes)
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