@Before
  public void setUp() {
    currentGfsh = gfshRule.executor().build();
    oldGfsh = gfshRule.executor().withVmConfiguration(sourceVmConfiguration).build();
  }
This test iterates through the versions of Geode and executes client compatibility with
the current version of Geode.
geode-assembly/src/upgradeTest/java/org/apache/geode/management/RollingUpgradeWithGfshDUnitTest.java