snuyanzin commented on code in PR #22632:
URL: https://github.com/apache/flink/pull/22632#discussion_r1204204907


##########
flink-runtime/src/test/java/org/apache/flink/runtime/checkpoint/ZooKeeperCompletedCheckpointStoreTest.java:
##########
@@ -54,32 +53,34 @@
 
 import static java.util.Collections.emptyList;
 import static 
org.apache.flink.runtime.checkpoint.CheckpointRetentionPolicy.NEVER_RETAIN_AFTER_TERMINATION;
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThrows;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /** Tests for {@link DefaultCompletedCheckpointStore} with {@link 
ZooKeeperStateHandleStore}. */
-public class ZooKeeperCompletedCheckpointStoreTest extends TestLogger {
+class ZooKeeperCompletedCheckpointStoreTest {
 
-    @ClassRule public static ZooKeeperResource zooKeeperResource = new 
ZooKeeperResource();
+    @RegisterExtension
+    public static AllCallbackWrapper<ZooKeeperExtension> 
zooKeeperExtensionWrapper =
+            new AllCallbackWrapper<>(new ZooKeeperExtension());
 
     private static final ZooKeeperCheckpointStoreUtil 
zooKeeperCheckpointStoreUtil =
             ZooKeeperCheckpointStoreUtil.INSTANCE;
 
     @Test
-    public void testPathConversion() {
+    void testPathConversion() {
         final long checkpointId = 42L;
 
         final String path = 
zooKeeperCheckpointStoreUtil.checkpointIDToName(checkpointId);
 
-        assertEquals(checkpointId, 
zooKeeperCheckpointStoreUtil.nameToCheckpointID(path));
+        
assertThat(zooKeeperCheckpointStoreUtil.nameToCheckpointID(path)).isEqualTo(checkpointId);
     }
 
     @Test
-    public void testRecoverFailsIfDownloadFails() {
+    void testRecoverFailsIfDownloadFails() {
         final Configuration configuration = new Configuration();
         configuration.setString(
-                HighAvailabilityOptions.HA_ZOOKEEPER_QUORUM, 
zooKeeperResource.getConnectString());
+                HighAvailabilityOptions.HA_ZOOKEEPER_QUORUM,
+                
zooKeeperExtensionWrapper.getCustomExtension().getConnectString());
         final List<Tuple2<RetrievableStateHandle<CompletedCheckpoint>, 
String>> checkpointsInZk =
                 new ArrayList<>();
         final ZooKeeperStateHandleStore<CompletedCheckpoint> 
checkpointsInZooKeeper =

Review Comment:
   it seems here `ZooKeeperUtils.startCuratorFramework` opens resources and 
doesn't close it.. May be put it in `try` resources block



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