@Override
  public void preTearDown() throws Exception {
    if (distributedTestFixture != this) {
      distributedTestFixture.preTearDown();
    }
  }
{@code preTearDown()} is invoked before {@link #doTearDownDistributedTestCase()}.

<p>
Override this as needed. Default implementation is empty.
geode-dunit/src/main/java/org/apache/geode/test/dunit/internal/JUnit4DistributedTestCase.java