單元測試藍鳥promise綁定函數

Question

我有以下函數使用bind將上下文綁定到then鏈。當我嘗試和測試，它拋出

TypeError: redisClient.hgetallAsync(...).bind is not a function 


myFunc() { 
    let self = this; 

    return redisClient.hgetallAsync('abcde') 
     .bind({ api: self }) 
     .then(doStuff) 
     .catch(err => { 
     // error 
     }); 
    } 

測試

let redisClient = { hgetallAsync: sinon.stub() }; 

describe('myFunc',() => { 
    beforeEach(() => { 
     redisCLient.hgetallAsync.resolves('content!'); 
    }); 

    it('should do stuff',() => { 
     return myFunc() 
     .should.eventually.be.rejectedWith('Internal Server Error') 
     .and.be.an.instanceOf(Error) 
     .and.have.property('statusCode', 500); 
    }); 
    }); 

Answer 1

的hgetallAsync存根返回一個純JS的承諾，而不是一個Bluebird承諾。

要使用Bluebird承諾，您需要告知Sinon使用.usingPromise()這樣做。

let redisClient = { hgetallAsync: sinon.stub().usingPromise(bluebird.Promise) }; 

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文檔鏈接： http://sinonjs.org/releases/v4.1.2/stubs/#stubusingpromisepromiselibrary