javascript async unit test framework

最新推荐文章于 2023-01-07 12:08:30 发布

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本文介绍了一个简化版的异步单元测试框架，展示了其基本原理和核心功能，包括使用集中式定时器进行调度等。提供了测试用例的示例，并提及了待实现的功能。

this is a rather simplied version of some asynchronous unit test framework, it is indeed far away from being able to be used as some real-world, production quality of unit test framework; however, it shows the basic/meat and potatos of what is required of a async unit test suite.

/**************************************
*@Summary
*  the framework that helps do the unit test in a asynchronous way
*
*  this will use a centrallized managed timer to do all the schedulings and so on. 
*
* @File: asyncunit.js
*
* @Usage:
*   

test(function() { 
  pause();
  setTimeout(function() { 
    assert(true, "First test completed");
    resume();
  }, 100);
});


test(function() { 
  pause();
  setTimeout(function() {
    assert(true, "Second test completed");
    resume();
  }, 200);
});

* @TODO:
* YOU MAY need to include the declaration of the assert calls..  
***************************************/


(function () {
  var queue = [], paused = false;

  this.test = function (fn) {
    queue.push(fn);
    runTest();
  };

  this.pause = function (fn) {
    paused = true;
  };


  this.resume = function (fn) {
    paused = false;
    // in some browser, it does not accept the value of 0 when you pass arguments to setTimeout. 
    // instead value of 1 has the similar effect or running the test immediately. as most of the browser have 
    // the granularity of about 10-15 milli-seconds
    setTimeout(runTest, 1);
  };

  function runTest() {
    if (!paused && queue.length) {
      queue.shift()();
      // some test function may call 'pause', so it makes sense to do the check 
      // before continuing the test
      if (!paused)  {
       resume();
      }
    }
  }


})();