public static DUnitEnv get() {
    if (instance == null) {
      try {
        // for tests that are still being migrated to the open-source
        // distributed unit test framework we need to look for this
        // old closed-source dunit environment
        Class clazz = Class.forName("dunit.hydra.HydraDUnitEnv");
        instance = (DUnitEnv) clazz.newInstance();
      } catch (Exception e) {
        throw new Error("Distributed unit test environment is not initialized");
      }
    }
    return instance;
  }
This class provides an abstraction over the environment that is used to run dunit. This will
delegate to the hydra or to the standalone dunit launcher as needed.

<p>
Any dunit tests that rely on hydra configuration should go through here, so that we can separate
them out from depending on hydra and run them on a different VM launching system.
geode-dunit/src/main/java/org/apache/geode/test/dunit/DUnitEnv.java