@Test
  public void test006GetParentRegion() throws Exception {
    PartitionedRegion pr = (PartitionedRegion) PartitionedRegionTestHelper
        .createPartitionedRegion("testGetParentRegion", String.valueOf(200), 0);
    Region parentRegion = pr.getParentRegion();
    if (parentRegion != null) {
      fail("getParentRegion method is not returning null as parent region for a PartitionedRegion");
    }

    if (logWriter.fineEnabled()) {
      logWriter.fine(
          "PartitionedRegionSingleNodeOperationsJUnitTest - testGetParentRegion() Completed Successfully");
    }
  }
Tests getParentRegion() API of PR. This should return null as PR doesnt have a parentRegion
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/PartitionedRegionSingleNodeOperationsJUnitTest.java