最近我准备构建一个自己的轻量级的库，但是我遇到了一些问题，最大的问题就是比如写着写着，我怕后面写的东西会覆盖掉前面的一些功能，所以我只能不停的测试，于是我想到了用一些测试库，试着安装传说中的mocha啥的，on my god,我的破电脑完全不给力装不上去，最后找了这一款超级轻量级的语法简单的测试库，而且还是牛逼的John Resig发明的.
```
QUnit.test( "isFunction", function( assert )
assert.expect( 2 );//指明回调里的断言的次数
function calc( x, operation ) {
return operation( x );
}
var result = calc( 2, function( x ) {
assert.ok( true, "calc() calls operation function" );
return x * x;
});
assert.equal( result, 4, "2 square equals 4" );
});
```
统计事件执行次数
```
QUnit.test( "a test", function( assert ) {
assert.expect( 1 );
var $body = $( "body" );
$body.on( "click", function() {
assert.ok( true, "body was clicked!" );
});
$body.trigger( "click" );
});
```
分组
```
QUnit.module( "group a" );
QUnit.test( "a basic test example", function( assert ) {
assert.ok( true, "this test is fine" );
});
QUnit.test( "a basic test example 2", function( assert ) {
assert.ok( true, "this test is fine" );
});
QUnit.module( "group b" );
QUnit.test( "a basic test example 3", function( assert ) {
assert.ok( true, "this test is fine" );
});
QUnit.test( "a basic test example 4", function( assert ) {
assert.ok( true, "this test is fine" );
});
```
stub:伪造一个方法
mock:不但伪造，而且这个方法必须执行