jest mock依賴項生成器函數

Question

我無法模擬簡單的依賴項生成器函數。

//generatorFunction.js 
export default()=>({execute: (arg1)=>Promise.resolve(arg1)}) 

//actualFunction.js 
import generate from 'generatorFunction' 
export default (arg1)=>generate(arg1) 

//actualFunction.test.js 
import actualFunction from './actualFunction' 
import generatorFunction from './generatorFunction' 
const resultingGeneratedFunction = generatorFunction(); 

jest.mock('generatorFunction',()=>jest.fn(()=>({execute:()=>Promise.resolve()}))) 
it('calls generateFunction', function(done){ 
    actualFunction(1).then(()=>{ 
    expect(resultingGeneratedFunction.execute).toHaveBeenCalledOnce() 
    done() 
    }) 
}) 

哪些錯誤作爲執行永遠不會被調用，儘管當我在控制檯的日誌裏面看到actualFunction被執行時被調用。

Answer 1

問題是，笑話不知道你在測試中的某個地方使用承諾。您要麼退還您使用async/await的承諾。看看docs

import actualFunction from './actualFunction' 
import generate from 'generatorFunction' 

jest.mock('generatorFunction',()=>jest.fn(()=>({execute:()=>Promise.resolve()}))) 
it('calls generateFunction', function(){ 
    return actualFunction(1).then(()=>{ 
    expect(generateFunction.execute).toHaveBeenCalledOnce() 
    }) 
}) 

import actualFunction from './actualFunction' 
import generate from 'generatorFunction' 

jest.mock('generatorFunction',()=>jest.fn(()=>({execute:()=>Promise.resolve()}))) 
it('calls generateFunction', async function(){ 
    const value = await actualFunction(1) 
    expect(generateFunction.execute).toHaveBeenCalledOnce() 
})