code: @Deployment(resources={"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"}) public void testRemoveVariablesLocal(){
    ProcessInstance processInstance=runtimeService.startProcessInstanceByKey("oneTaskProcess");
    Task currentTask=taskService.createTaskQuery().singleResult();
    Map<String,Object> varsToDelete=new HashMap<String,Object>();
    varsToDelete.put("variable1","value1");
    varsToDelete.put("variable2","value2");
    taskService.setVariablesLocal(currentTask.getId(),varsToDelete);
    taskService.setVariableLocal(currentTask.getId(),"variable3","value3");
    assertEquals("value1",taskService.getVariable(currentTask.getId(),"variable1"));
    assertEquals("value2",taskService.getVariable(currentTask.getId(),"variable2"));
    assertEquals("value3",taskService.getVariable(currentTask.getId(),"variable3"));
    assertEquals("value1",taskService.getVariableLocal(currentTask.getId(),"variable1"));
    assertEquals("value2",taskService.getVariableLocal(currentTask.getId(),"variable2"));
    assertEquals("value3",taskService.getVariableLocal(currentTask.getId(),"variable3"));
    taskService.removeVariables(currentTask.getId(),varsToDelete.keySet());
    assertNull(taskService.getVariable(currentTask.getId(),"variable1"));
    assertNull(taskService.getVariable(currentTask.getId(),"variable2"));
    assertEquals("value3",taskService.getVariable(currentTask.getId(),"variable3"));
    assertNull(taskService.getVariableLocal(currentTask.getId(),"variable1"));
    assertNull(taskService.getVariableLocal(currentTask.getId(),"variable2"));
    assertEquals("value3",taskService.getVariableLocal(currentTask.getId(),"variable3"));
    checkHistoricVariableUpdateEntity("variable1",processInstance.getId());
    checkHistoricVariableUpdateEntity("variable2",processInstance.getId());
  }
  