[英]How can i test a TypeORM repository method with local dependency
我是 Node 的新手,我正在嘗試使用 Mocha 和 Sinon 測試 TypeORM 自定義存儲庫,而不會訪問數據庫。
我的 Repository 有一個方法,它接受 2 個參數並返回一個 Promise。 它使用本地查詢構建器,我想監視它(queryBuilder)以了解其方法被調用的次數。 這是我的自定義存儲庫:
@EntityRepository(Pratica)
export class PraticaRepository extends Repository<Pratica> {
list(targa?: string, tipoVeicolo?: string): Promise<Pratica[]> {
fileLogger.log('info','inizio - targa: %s; tipoVeicolo %s.', targa, tipoVeicolo);
let queryBuilder: SelectQueryBuilder<Pratica> = this.createQueryBuilder("p")
.leftJoinAndSelect("p.stato", "stato")
.leftJoinAndSelect("p.microstato", "microstato");
let filtered: boolean = false;
if(targa && targa !== ""){
fileLogger.debug("Applico filtro targa");
filtered = true;
queryBuilder.where("p.targa = :targa", {targa: targa});
}
if(tipoVeicolo && tipoVeicolo !== ""){
if(!filtered){
fileLogger.debug("Applico filtro tipoVeicolo");
filtered = true;
queryBuilder.where("p.tipoVeicolo = :tipoVeicolo", {tipoVeicolo: tipoVeicolo});
}else{
fileLogger.debug("Applico filtro tipoVeicolo come parametro aggiuntivo");
queryBuilder.andWhere("p.tipoVeicolo = :tipoVeicolo", {tipoVeicolo: tipoVeicolo});
}
}
fileLogger.log('debug', "Sql generato: %s", queryBuilder.getSql);
fileLogger.info("fine");
return queryBuilder.getMany();
}
我已經嘗試過類似以下的事情:
describe('PraticaRepository#list', () => {
it.only('should call getMany once', async () => {
let result = new Promise((resolve,reject) => {
resolve(new Array(new Pratica(), new Pratica()))
});
let getMany = sinon.stub().returns(result);
typeorm.createQueryBuilder = sinon.stub().returns({
select: sinon.stub(),
from: sinon.stub(),
leftJoinAndSelect: sinon.stub(),
where: sinon.stub(),
orderBy: sinon.stub(),
getMany: getMany
})
let cut = new PraticaRepository();
const appo = cut.list('','');
sinon.assert.calledOnce(getMany);
});
})
但顯然我收到以下錯誤:
1) PraticaRepository#list
should call getMany once:
TypeError: Cannot read property 'createQueryBuilder' of undefined
at PraticaRepository.Repository.createQueryBuilder (src\repository\Repository.ts:50:29)
at PraticaRepository.list (src\repositories\PraticaRepository.ts:12:62)
因為我存根的查詢構建器不是在 Repository 方法中實例化的那個。 我的問題:
先感謝您。
感謝@oligofren 的建議,這是我的最終解決方案:
let sandbox;
let createQueryBuilderStub;
let mock;
let fakeQueryBuilder = new SelectQueryBuilder<Pratica>(null);
beforeEach(() => {
sandbox = sinon.createSandbox();
mock = sandbox.mock(fakeQueryBuilder);
createQueryBuilderStub = sandbox.stub(Repository.prototype,
'createQueryBuilder').withArgs("p").returns(fakeQueryBuilder);
});
afterEach(() => {
sandbox.restore();
});
describe('PraticaRepository#list', () => {
it('should get the result with no filters', async () => {
mock.expects('leftJoinAndSelect').twice().returns(fakeQueryBuilder);
mock.expects('where').never();
mock.expects('andWhere').never();
mock.expects('getSql').once();
mock.expects('getMany').once();
let cut = new PraticaRepository();
const appo = cut.list();
sinon.assert.calledOnce(createQueryBuilderStub);
mock.verify();
});
})
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