assertNotNull(engine);
KieSession ksession = engine.getKieSession();
assertNotNull(ksession);
ProcessInstance processInstance = ksession.startProcess("org.jbpm.writedocument");
// check the state of process instance
processInstance = ksession.getProcessInstance(processInstance.getId());
assertNotNull(processInstance);
assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());