@After
  public void tearDown() {
    disconnectAllFromDS();
    invokeInEveryVM(() -> PRQueryDUnitHelper.setCache(null));
  }
This tests creates partition regions with 1 Datastore & 1 Accessor node, firing a simple query
and validating the ResultSet size and Contents.
geode-core/src/distributedTest/java/org/apache/geode/cache/query/partitioned/PRBasicQueryDUnitTest.java