如何解决Sails.js:无法将辅助程序存根用于单元测试
节点版本:v12.18.3 帆船版本 (帆船):1.2.3
执行单元测试时,我无法使用帆助手。我有一个助手来处理与数据库的所有通信。而且,我有一个使用此帮助程序的API。在我的测试中,我试图像这样使用sinon对助手进行打桩:
API:
fn: async function (inputs,exits) {
// Stuff done here
// I need to stub this helper
let result = await sails.helpers.arangoQuery.with({
requestId: REQUEST_ID,query: query,queryParams: params
});
}
我的测试:
describe('Get Organization',() => {
it('Server Error - Simulates a failure in fetching the data from ArangoDB',(done) => {
sinon.stub(sails.helpers,'arangoQuery').returns(null,{status: "success"});
supertest(sails.hooks.http.app)
.get('/organization')
//.expect(200)
.end((error,response) => {
return done()
}
})
})
运行测试时,出现以下错误:
error: Error: cannot GET /organization (500)
at Response.toError (/opt/designhubz/organization-service/node_modules/superagent/lib/node/response.js:94:15)
at ResponseBase._setStatusProperties (/opt/designhubz/organization-service/node_modules/superagent/lib/response-base.js:123:16)
at new Response (/opt/designhubz/organization-service/node_modules/superagent/lib/node/response.js:41:8)
at Test.Request._emitResponse (/opt/designhubz/organization-service/node_modules/superagent/lib/node/index.js:752:20)
at /opt/designhubz/organization-service/node_modules/superagent/lib/node/index.js:916:38
at IncomingMessage.<anonymous> (/opt/designhubz/organization-service/node_modules/superagent/lib/node/parsers/json.js:19:7)
at IncomingMessage.emit (events.js:327:22)
at endReadableNT (_stream_readable.js:1220:12)
at processTicksAndRejections (internal/process/task_queues.js:84:21) {
status: 500,text: '{}',method: 'GET',path: '/organization'
}
根本没有关于此问题的文档。谁能告诉我如何向助手打桩?
解决方法
风帆助手使用machine,这会使存根变得更加棘手。
AFAIK ,通过对真正的 fn 函数进行存根,可以替代存根帆助手,因为计算机将调用助手的fn函数。>
更新:更改使用超级测试的示例。
例如:
- 我使用HelloController创建端点GET / hello,
- 我使用helper's example中的帮助程序format-welcome-message,
- 我为端点GET / hello创建测试规范。
- 我使用不带lifecycle.js的mocha来运行它,但将生命周期嵌入了测试规范(reference)中。
端点GET / hello定义:
// File: HelloController.js
module.exports = {
hello: async function (req,res) {
// Dummy usage of helper with predefined input test.
const output = await sails.helpers.formatWelcomeMessage.with({ name: 'test' });
// Just send the output.
res.send(output);
}
};
不要忘记在config / routes.js中添加路由:'GET /hello': 'HelloController.hello'
。
测试规范包含3种情况(正常调用,存根错误和存根成功)。
// File: hello.test.js
const sails = require('sails');
const sinon = require('sinon');
const { expect } = require('chai');
const supertest = require('supertest');
describe('Test',function () {
let fwm;
// Copy from example testing lifecycle.
before(function(done) {
sails.lift({
hooks: { grunt: false },log: { level: 'warn' },},function(err) {
if (err) { return done(err); }
// Require helper format welcome message here!
fwm = require('../api/helpers/format-welcome-message');
return done();
});
});
after(function(done) {
sails.lower(done);
});
it('normal case',function (done) {
// Create spy to make sure that real helper fn get called.
const spy = sinon.spy(fwm,'fn');
supertest(sails.hooks.http.app)
.get('/hello')
.expect(200)
// Expect endpoint output default value.
.expect('Hello,test!')
.end(function() {
// Make sure spy is called.
expect(spy.calledOnce).to.equal(true);
// Restore spy.
spy.restore();
done();
});
});
it('case stub error',function (done) {
// Stub the real fn function inside custom helper.
const stubError = sinon.stub(fwm,'fn');
stubError.callsFake(async function (input,exits) {
// Setup your error here.
exits.error(new Error('XXX'));
});
supertest(sails.hooks.http.app)
.get('/hello')
.expect(500)
.end(function() {
// Make sure stub get called once.
expect(stubError.calledOnce).to.equal(true);
// Restore stub.
stubError.restore();
done();
});
});
it('case stub success',function (done) {
// Define fake result.
const fakeResult = 'test';
// Stub the real fn function inside custom helper.
const stubSuccess = sinon.stub(fwm,'fn');
stubSuccess.callsFake(async function (input,exits) {
// Setup your success result here.
exits.success(fakeResult);
});
supertest(sails.hooks.http.app)
.get('/hello')
// Expect endpoint to output fake result.
.expect(fakeResult)
.end(function() {
// Make sure stub get called once.
expect(stubSuccess.calledOnce).to.equal(true);
// Restore stub.
stubSuccess.restore();
done();
});
});
});
当我使用mocha运行它时:
$ npx mocha test/hello.test.js
Test
✓ normal case
error: Sending 500 ("Server Error") response:
Error: XXX
at Object.<anonymous> ...
✓ case stub error
✓ case stub success
3 passing (407ms)
$
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