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https://issues.apache.org/jira/browse/GEODE-8351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154968#comment-17154968
 ] 

ASF GitHub Bot commented on GEODE-8351:
---------------------------------------

dschneider-pivotal commented on a change in pull request #5364:
URL: https://github.com/apache/geode/pull/5364#discussion_r452526273



##########
File path: 
geode-redis/src/distributedTest/java/org/apache/geode/redis/internal/data/DeltaDUnitTest.java
##########
@@ -0,0 +1,339 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+
+package org.apache.geode.redis.internal.data;
+
+import static 
org.apache.geode.distributed.ConfigurationProperties.MAX_WAIT_TIME_RECONNECT;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+import redis.clients.jedis.Jedis;
+
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.partition.PartitionRegionHelper;
+import org.apache.geode.internal.cache.InternalCache;
+import org.apache.geode.test.awaitility.GeodeAwaitility;
+import org.apache.geode.test.dunit.rules.ClusterStartupRule;
+import org.apache.geode.test.dunit.rules.MemberVM;
+import org.apache.geode.test.dunit.rules.RedisClusterStartupRule;
+
+public class DeltaDUnitTest {
+
+  @ClassRule
+  public static RedisClusterStartupRule clusterStartUp = new 
RedisClusterStartupRule(4);
+
+  private static final String LOCAL_HOST = "127.0.0.1";
+  private static final int SET_SIZE = 10;
+  private static final int JEDIS_TIMEOUT =
+      Math.toIntExact(GeodeAwaitility.getTimeout().toMillis());
+  private static Jedis jedis1;
+  private static Jedis jedis2;
+
+  private static Properties locatorProperties;
+
+  private static MemberVM locator;
+  private static MemberVM server1;
+  private static MemberVM server2;
+
+  private static int redisServerPort1;
+  private static int redisServerPort2;
+
+  @BeforeClass
+  public static void classSetup() {
+    locatorProperties = new Properties();
+    locatorProperties.setProperty(MAX_WAIT_TIME_RECONNECT, "15000");
+
+    locator = clusterStartUp.startLocatorVM(0, locatorProperties);
+    server1 = clusterStartUp.startRedisVM(1, locator.getPort());
+    server2 = clusterStartUp.startRedisVM(2, locator.getPort());
+
+    redisServerPort1 = clusterStartUp.getRedisPort(1);
+    redisServerPort2 = clusterStartUp.getRedisPort(2);
+
+    jedis1 = new Jedis(LOCAL_HOST, redisServerPort1, JEDIS_TIMEOUT);
+    jedis2 = new Jedis(LOCAL_HOST, redisServerPort2, JEDIS_TIMEOUT);
+  }
+
+  @Before
+  public void testSetup() {
+    jedis1.flushAll();
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    jedis1.disconnect();
+    jedis2.disconnect();
+
+    server1.stop();
+    server2.stop();
+  }
+
+  @Test
+  public void shouldCorrectlyPropagateDeltaToSecondaryServer_whenAppending() {
+    String key = "key";
+    String baseValue = "value-";
+    jedis1.set(key, baseValue);
+    for (int i = 0; i < SET_SIZE; i++) {
+      jedis1.set(key, String.valueOf(i));
+
+      String server1LocalValue = server1.invoke(() -> {

Review comment:
       It seems like you could write it in a way that it is the same for each 
test. You really don't care in this test what is in each server; just that 
whatever one server has the other does also.




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> DUnit tests for Delta Propagation
> ---------------------------------
>
>                 Key: GEODE-8351
>                 URL: https://issues.apache.org/jira/browse/GEODE-8351
>             Project: Geode
>          Issue Type: Test
>          Components: redis, tests
>            Reporter: Sarah Abbey
>            Priority: Major
>
> Need to confirm that when deltas are propagated, the data is correctly stored 
> on the secondary



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