英文:
using sinon stub to test a method on an object
问题
我想在对象内部测试一个函数。 代码，我们将其称为someFile.js，结构如下。
import someService from 'a-location';const val = someService.getVal();const AnObject = {someMethod() {if (val) //dosomething}}export default AnObject;
在测试文件中，我有以下代码
import someService from 'a-location';import AnObject from 'someFile';describe("description", function () {it('more description', function () {sinon.stub(someService, 'getVal').returns('my-val');AnObject.someMethod();})})
我希望在someFile.js中调用someService.getVal()时接收'my-val'，但它并没有按预期工作。 我做错了什么？
英文:
I want to test a function inside an object. The code, lets call it someFile.js, is structured as below.
import someService from 'a-location';const val = someService.getVal();const AnObject = {someMethod() {if(val) //dosomething}}export default AnObject;
In the test file, I have code as below
import someService from 'a-location';import AnObject from 'someFile';describe("description", function(){it('more description', function() {sinon.stub(someService, 'getVal').returns('my-val');AnObject.someMethod();})})
I was hoping to receive 'my-val' when someService.getVal() is called in the someFile.js but it isn't working as expected. What am I doing wrong?
答案1
得分: 0
你应该在存根化后使用import()来动态导入someFile中的AnObject。
例如：
some-file.ts:
import someService from './a-location';const val = someService.getVal();const AnObject = {someMethod() {console.log('val: ', val);},};export default AnObject;
a-location.ts:
const someService = {getVal() {return 'real val';},};export default someService;
some-file.test.ts:
import sinon from 'sinon';import someService from './a-location';describe('description', () => {it('more description', async () => {sinon.stub(someService, 'getVal').returns('my-val');const AnObject = (await import('./some-file')).default;AnObject.someMethod();});});
测试结果：
descriptionval: my-val✓ more description1 passing (8ms)
正如你所见，val是my-val，这是一个存根化的值。
英文:
You should use import() to import the AnObject from someFile dynamically after stubbing.
E.g.
some-file.ts:
import someService from './a-location';const val = someService.getVal();const AnObject = {someMethod() {console.log('val: ', val);},};export default AnObject;
a-location.ts:
const someService = {getVal() {return 'real val';},};export default someService;
some-file.test.ts:
import sinon from 'sinon';import someService from './a-location';describe('description', () => {it('more description', async () => {sinon.stub(someService, 'getVal').returns('my-val');const AnObject = (await import('./some-file')).default;AnObject.someMethod();});});
Test result:
descriptionval: my-val✓ more description1 passing (8ms)
As you can see, the val is my-val which is a stubbed value.
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