节点JS单元测试兴农柴

Question

如何为波纹管文件中创建单元测试

index.ts

import ---- 
import ---- 

let workerService = new WorkerService(); 
let creatWorkerPromise = Promise.promisify(workerService.createWorkers); 

creatWorkerPromise() 
.then(function(){ 
    let kafkaService = new KafkaService(kafkaConfig, workerService); 
}) 
.catch(function (err: any) { 
    console.log('Error while creating workers:', err); 
}); 

Answer 1

这是一种难以测试的东西是不是一个单位，作为单位通常会暴露要测试的方法，所以我假设您最终在测试代码中执行此操作。所以这里有云：

/////////// 
 
// index.js 
 
/////////// 
 
// stubs for this example to work 
 
var createWorkerPromise = function(){ return Promise.resolve(); } 
 
var workerService, kafkaConfig; 
 
function KafkaService(){ throw new Error("crashes test"); } 
 

 
function exportedFunction(){ 
 
    return createWorkerPromise() 
 
    .then(function(){ 
 
     var kafkaService = new KafkaService(kafkaConfig, workerService); 
 
    }) 
 
    .catch(function (err) { 
 
     console.log('Error while creating workers:', err); 
 
    }); 
 
} 
 

 
/////////// 
 
// test.js 
 
/////////// 
 
var log = console.log.bind(console); 
 
var assert = function(expr) { 
 
    if(!expr) throw new Error("AssertionError"); 
 
    log("TEST OK"); 
 
} 
 

 
// the test 
 
var spy = sinon.spy(console, 'log'); 
 
exportedFunction().then(function test() { 
 
    assert(spy.called); 
 
    
 
}).catch(log.bind(null, "TEST FAILED"))

<script src="https://unpkg.com/sinon@latest/pkg/sinon.js"></script>