@Before
  public void setUp() {
    vm0 = getVM(0);
    vm1 = getVM(1);
    vm2 = getVM(2);
    vm3 = getVM(3);

    uniqueName = getClass().getSimpleName() + "_" + testName.getMethodName();
    regionName = uniqueName + "_region";

    vm0.invoke(() -> cacheRule.createCache());
    vm1.invoke(() -> cacheRule.createCache());
    vm2.invoke(() -> cacheRule.createCache());
    vm3.invoke(() -> cacheRule.createCache());
  }
Tests the functionality of cache regions whose contents may be written to disk.

@since GemFire 3.2
geode-core/src/distributedTest/java/org/apache/geode/cache30/DiskRegionDistributedTest.java