jolshan commented on code in PR #14417:
URL: https://github.com/apache/kafka/pull/14417#discussion_r1344714254


##########
core/src/test/scala/unit/kafka/coordinator/group/CoordinatorLoaderImplTest.scala:
##########
@@ -283,7 +292,63 @@ class CoordinatorLoaderImplTest {
         minOneMessage = true
       )).thenReturn(readResult)
 
-      assertNull(loader.load(tp, coordinator).get(10, TimeUnit.SECONDS))
+      assertNotNull(loader.load(tp, coordinator).get(10, TimeUnit.SECONDS))
+    }
+  }
+
+  @Test
+  def testLoadSummary(): Unit = {
+    val tp = new TopicPartition("foo", 0)
+    val replicaManager = mock(classOf[ReplicaManager])
+    val serde = new StringKeyValueDeserializer
+    val log = mock(classOf[UnifiedLog])
+    val coordinator = mock(classOf[CoordinatorPlayback[(String, String)]])
+    val time = new MockTime()
+
+    TestUtils.resource(new CoordinatorLoaderImpl[(String, String)](
+      time,
+      replicaManager = replicaManager,
+      deserializer = serde,
+      loadBufferSize = 1000
+    )) { loader =>
+      val startTimeMs = time.milliseconds()
+      when(replicaManager.getLog(tp)).thenReturn(Some(log))
+      when(log.logStartOffset).thenReturn(0L)
+      when(replicaManager.getLogEndOffset(tp)).thenReturn(Some(5L))
+
+      val readResult1 = logReadResult(startOffset = 0, records = Seq(
+        new SimpleRecord("k1".getBytes, "v1".getBytes),
+        new SimpleRecord("k2".getBytes, "v2".getBytes)
+      ))
+
+      when(log.read(
+        startOffset = 0L,
+        maxLength = 1000,
+        isolation = FetchIsolation.LOG_END,
+        minOneMessage = true
+      )).thenAnswer((_: InvocationOnMock) => {
+        time.sleep(1000)

Review Comment:
   I think the idea was that we would have a different value for the end time 
for the check on line 349. I think this is ok.



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