@Override
  public final void postSetUp() throws Exception {
    Host host = Host.getHost(0);
    VM vm0 = host.getVM(0);
    Object[] o = new Object[1];
    o[0] = "IdleTimeOutDUnitTest";
    vm0.invoke(IdleTimeOutDUnitTest.class, "init", o);
  }
Return file as string and then modify the string accordingly **
geode-core/src/distributedTest/java/org/apache/geode/internal/jta/dunit/IdleTimeOutDUnitTest.java