如何编写仅导出一个函数的嵌套Sagas的单元测试用例？

Question

我的sagas文件如下：-

function* handleAPIs(request){  
    let response ;
  try{
        switch(request.params.type){

                case "GET":
                    response = yield call(genericGetAPI,request.params.url);    
                    yield put({type: HANDLE_STATE, stateValues: [{'key':request.params.responseStateVariable,'value':response}]}); 

                    response = yield call(genericGetAPI, url);    
                    yield put({type: HANDLE_STATE, stateValues: [{'key':request.params.responseStateVariable,'value':response}]}); 
                break;
            case "POST": 
                        response = yield call(genericPostAPI, {'fields':request.params.requestParams,'url':request.params.url});    
                        yield put({type: HANDLE_STATE, stateValues: [{'key':request.params.responseStateVariable,'value':response}]}); 
                break; 
                case "PUT": 
                response = yield call(genericPutAPI, {'fields':request.params.requestParams,'url':request.params.url});    
                yield put({type: HANDLE_STATE, stateValues: [{'key':request.params.responseStateVariable,'value':response}]}); 
        break; 
            case "DELETE":  
                        response = yield call(genericDeleteAPI,request.params.url);    
                        yield put({type: HANDLE_STATE, stateValues: [{'key':request.params.responseStateVariable,'value':response}]}); 
                break;
        }    
  } catch (error) {
    yield put({type: REQUEST_ERROR, error: error.message});

  } finally {
    yield put({type: SENDING_REQUEST, sending: false});
  }
}

export function* handleAPI(){ 
    yield takeEvery(HANDLE_API,handleAPIs);
}

我的Sagas测试文件如下：-

import { testSaga } from 'redux-saga-test-plan';
import {
    HANDLE_API,
  } from '../constants';
import { handleAPI } from '../sagas';

describe('Saga file testing', () => {
  it('Handle API', () => {
    testSaga(handleAPI)
    .next()
    .takeEvery(HANDLE_API)
    .finish()
    .isDone();
  });
});

由于我不能使用handleAPIs传奇函数，因为它在导出中不存在。如何编写以下文件的测试用例？ 我正在使用redux-saga-test-plan。