@Test
  public void testDisconnects() throws Exception {
    invokeInEveryVM(() -> {
      assertThat(getDistributedSystemProperties()).isNotEmpty();
    });
    invokeInEveryVM(() -> {
      assertThat(getSystem().isConnected()).isTrue();
    });
  }
Verifies that overriding {@code getDistributedSystemProperties} results in
{@code disconnectAllFromDS} during tear down.
geode-dunit/src/distributedTest/java/org/apache/geode/test/dunit/tests/OverridingGetPropertiesDisconnectsAllDistributedTest.java