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[英]how to get the return value of an async function after then is called on the async function
[英]How to mock return value of async function?
我正在尝试测试使用“ easy-soap-request”库的功能。 我想模拟“ soapRequest”函数返回的结果。
我已经尝试过了,但是没有用,我一直从外部API获取数据。
client.js
const soapRequest = require('easy-soap-request');
async function get_data(){
var response = await soapRequest(url, auth_headers) //this is what I want to mock
var result;
result = some_parsing_function(response); //this is what I want test
return result;
}
test.js
const client = require('../../client');
describe('get_data tests', () =>{
it('should test sth', function (done) {
var stubed = stub(client, 'soapRequest').returns('dummy value');
client.get_data().then((result) => {
//assertions
console.log(result) //result still has value from external service
done();
});
})
});
编辑:
因此,我尝试按照答案之一的建议使用sinon.fake()。
const client = require('../../client');
describe('get_data tests', () =>{
it('should test sth', function (done) {
var fake_soap = fake(async () => {
return 12345;
});
replace(cilent, 'soapRequest', fake_soap);
client.soapRequest().then((res) => {
console.log(res); // 12345
})
client.get_data().then((result) => {
//assertions
console.log(result) //still original value from external service
done();
});
})
});
在源文件中, soapRequest
变量本身是一个未命名为import(对象)的函数,因此仅依靠sinon.stub
是不可能的。
如果看一下easy-soap-request
源代码,很明显,它会导出一个函数https://github.com/circa10a/easy-soap-request/blob/master/index.js#L14
根据我的经验,对于这种情况,可以通过添加如下所示的proxyquire
来解决。
const proxyquire = require('proxyquire');
const sinon = require('sinon');
// we mock `easy-soap-request` (the library name) by using `sinon.stub`
const client = proxyquire('../../client', { 'easy-soap-request': sinon.stub().returns('dummy value') })
describe('get_data tests', () =>{
it('should test sth', async () => { // use async/await for better code
const result = await client.get_data();
console.log(result); // dummy value
})
});
如果您不想使用sinon
,也可以这样做
const client = proxyquire('../../client', { 'easy-soap-request': () => 'dummy value' })
参考:
https://www.npmjs.com/package/proxyquire
希望能帮助到你
这样可以:
let asyncHandler = sinon.fake(async () => {});
更新:
我的错! 我对这个问题不太了解。 这是解决它的一种方法。 此外,最好将外部依赖项与应用程序逻辑分开。 因此,我添加了一个新的文件来请求肥皂。 然后,取消测试请求变得容易。
soap-connector.js
const soapRequest = require('easy-soap-request');
exports.request = async function request(url, auth_headers) {
return soapRequest(url, auth_headers);
};
client.js
const soapConnector = require('./soap-connector');
async function get_data(){
var response = await soapConnector.request(url, auth_headers) //this is what I want to mock
var result;
result = some_parsing_function(response); //this is what I want test
return result;
}
test.js
const soapConnector = require('../../soap-connector');
const client = require('../../client');
describe('get_data tests', () =>{
it('should test sth', function (done) {
var stubed = stub(soapConnector, 'request').callsFake(async () => {
return 12345;
});
client.get_data().then((result) => {
//assertions
console.log(result) //result still has value from external service
done();
});
})
});
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