Github user shralex commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/292#discussion_r125806125
--- Diff:
src/java/test/org/apache/zookeeper/server/quorum/ReconfigRollingRestartCompatibilityTest.java
---
@@ -0,0 +1,263 @@
+/**
+ * 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
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+
+package org.apache.zookeeper.server.quorum;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.Set;
+import java.util.List;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.ArrayList;
+
+import org.apache.zookeeper.ZooKeeper;
--- End diff --
you don't really need leavingServers - you can pass null instead of it in
all the tests since no one is leaving
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