@Before
  public void setUp() throws Exception {
    uniqueName = getClass().getSimpleName() + "_" + testName.getMethodName();
    regionName = uniqueName;

    diskDirs = new File[] {temporaryFolder.newFolder(uniqueName)};

    LocalRegion.ISSUE_CALLBACKS_TO_CACHE_OBSERVER = true;

    observer = spy(CacheObserver.class);

    addIgnoredException("Entry has been cleared and is not present on disk");
  }
The Clear operation during a NetSearchMessage.doGet() in progress can cause DiskAccessException
by accessing cleared oplogs and eventually destroy region. The Test verifies that fix prevents
this.

<p>
Test must be DistributedTest because it requires ClusterDistributionManager.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClearDuringNetSearchOplogRegressionTest.java