javascript - 使用 setTimeout 测试 IIFE

Question

测试使用 setTimeout 递归调用自身的 IIFE(立即调用函数表达式)的最佳方法是什么:

(function myFuncToBeTested() {
  // Code to be tested 
  ...
  setTimeout(myFuncToBeTested, timeout) // timeout should be checked
})()

我找到了以下解决方案，用自己的 stub 替换全局setTimeout函数。这有以下问题:

// Saving original setTimeout. This should be restored in test cleanup
originalSetTimeout = global.setTimeout

// Replace  with function
global.setTimeout = function setImmediate(myFunc, interval) {
   // FIXME: This function now always called

   // Save interval to be tested
   savedInterval = interval
}

Answer 1

这个函数可以做成一个对象吗？

var myObject = (function(){

    function start(){
        myFuncToBeTested();       
        setTimeout(start, 10);
        return this;
    }

    function myFunctToBeTested(){
        //Code to be tested
    }

    return {
        start: start,
        myFuncToBeTested: myFuncToBeTested
    }
})().start();

然后您可以使用您选择的测试框架来测试:

assert( myObject.myFuncToBeTested() == expectedValue );