Node.js 无法使用jest在nodejs中模拟类的实例函数(来自类的新实例的函数)
在component.js中,需要模拟行:Node.js 无法使用jest在nodejs中模拟类的实例函数(来自类的新实例的函数),node.js,jestjs,mocking,jest-mock-axios,Node.js,Jestjs,Mocking,Jest Mock Axios,在component.js中,需要模拟行: const accessValue = await objValueClass.getValue(); 运行component.test.js时,在console.logaccessValue中出现undefined component.test.js description('**处理程序单元测试**',()=>{ 测试('test1',async()=>{ const{ValueClass}=require('../../ValueClass')
const accessValue = await objValueClass.getValue();
运行component.test.js时,在console.log
accessValue
中出现undefined
component.test.js
description('**处理程序单元测试**',()=>{
测试('test1',async()=>{
const{ValueClass}=require('../../ValueClass');
jest.mock('../../ValueClass');
const objValueClass=新的ValueClass();
objValueClass.getValue.mockResolvedValue('abcd');
常量{component}=require('../../component');
const res=等待组件();
});
});
component.js
const { ValueClass } = require('../../ValueClass');
const component = async () => {
const objValueClass = new ValueClass();
const accessValue = await objValueClass.getValue();
console.log('accessValue###', accessValue);
}
module.exports = component;
ValueClass.js
class ValueClass {
async getValue() {
const a = 'a';
const b = 'b';
return a+b;
}
}
module.exports = {
ValueClass
};
以下是我的单元测试解决方案:
component.test.js
:
const{ValueClass}=require('./ValueClass');
const component=require(“./component”);
jest.mock('./ValueClass',()=>{
常量值ClassInstance={
getValue:jest.fn(),
};
返回{ValueClass:jest.fn(()=>valueClassInstance)};
});
描述(“**处理器单元测试**”,()=>{
毕竟(()=>{
jest.resetAllMocks();
});
测试('test1',async()=>{
const objValueClass=新的ValueClass();
objValueClass.getValue.mockResolvedValue('abcd');
const res=等待组件();
expect(objValueClass.getValue).toBeCalledTimes(1);
});
});
单元测试结果:
PASS src/stackoverflow/65097473/component.test.js (9.297s)
** Handler unit tests **
✓ test 1 (16ms)
console.log src/stackoverflow/65097473/component.js:764
accessValue### abcd
--------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
--------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
component.js | 100 | 100 | 100 | 100 | |
--------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 10.508s
测试中的objValueClass与组件中的实例不同。它应该是
ValueClass.prototype.getValue.mockResolvedValue(…)
。在@EstusFlask中起作用。感谢感谢@slideshowp2