jchen21 commented on a change in pull request #5014:
URL: https://github.com/apache/geode/pull/5014#discussion_r420998299



##########
File path: 
geode-core/src/test/java/org/apache/geode/internal/cache/GemFireCacheImplTest.java
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@@ -620,6 +625,40 @@ public void getCacheServers_isCanonical() {
         .isSameAs(gemFireCacheImpl.getCacheServers());
   }
 
+  @Test
+  public void testLockDiskStore() throws InterruptedException {
+    int nThread = 10;
+    String diskStoreName = "MyDiskStore";
+    AtomicInteger nTrue = new AtomicInteger();
+    AtomicInteger nFalse = new AtomicInteger();
+    ExecutorService executorService = Executors.newFixedThreadPool(nThread);

Review comment:
       I had thought about using `ExecutorServiceRule`. However, the return 
value of `doLockDiskStore()` is non-deterministic. I can't assert the return 
value of individual thread. I can only count and assert the number of returning 
values when all threads are done. I am not sure how `ExecutorServiceRule` will 
serve this test case.




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