hachikuji commented on a change in pull request #10913:
URL: https://github.com/apache/kafka/pull/10913#discussion_r656588602



##########
File path: raft/src/test/java/org/apache/kafka/raft/KafkaRaftClientTest.java
##########
@@ -359,6 +360,150 @@ public void testResignWillCompleteFetchPurgatory() throws 
Exception {
         assertFalse(context.client.isShuttingDown());
     }
 
+    @Test
+    public void testResignInOlderEpochIgnored() throws Exception {
+        int localId = 0;
+        int otherNodeId = 1;
+        Set<Integer> voters = Utils.mkSet(localId, otherNodeId);
+
+        RaftClientTestContext context = new 
RaftClientTestContext.Builder(localId, voters).build();
+
+        context.becomeLeader();
+        assertEquals(OptionalInt.of(localId), context.currentLeader());
+
+        int currentEpoch = context.currentEpoch();
+        context.client.resign(currentEpoch - 1);
+        context.assertElectedLeader(currentEpoch, localId);
+    }
+
+    @Test
+    public void testHandleBeginQuorumEpochAfterUserInitiatedResign() throws 
Exception {
+        int localId = 0;
+        int remoteId1 = 1;
+        int remoteId2 = 2;
+        Set<Integer> voters = Utils.mkSet(localId, remoteId1, remoteId2);
+
+        RaftClientTestContext context = new 
RaftClientTestContext.Builder(localId, voters).build();
+
+        context.becomeLeader();
+        assertEquals(OptionalInt.of(localId), context.currentLeader());
+
+        int resignedEpoch = context.currentEpoch();
+
+        context.client.resign(resignedEpoch);
+        context.pollUntil(context.client.quorum()::isResigned);
+
+        context.deliverRequest(context.beginEpochRequest(resignedEpoch + 1, 
remoteId1));
+        context.pollUntilResponse();
+        context.assertSentBeginQuorumEpochResponse(Errors.NONE);
+        context.assertElectedLeader(resignedEpoch + 1, remoteId1);

Review comment:
       I'm inclined to do it in other tests to keep the test from getting too 
bloated. It looks like we do not have many tests for `handleLeaderChange` at 
the moment, so let me try to address the gap.




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