NUnit是我们经常使用的测试框架，既然常用，肯定会有人难不住寂寞给TA加上一些自己认为酷的功能上去，也就是扩展，那下面我们就看看到底有几种扩展。
Extension类型
Add In
嵌入NUnit内部，改变TA的行为，通常提供一种全新的测试方式，比方说FireBenchmarkers就给NUit加上了性能测试。
Add On
在Unit上方或者外部，不像Add In一样修改NUint的行为，通常他们都用来测试一种特殊的应用，或者实现一种新的测试书写风格
Runners
提供另外一种方式运行NUnit
Extras
除了上面三种之外的，典型的例子是加test report
Available Extensions
| ↓ Extension | Description | Type | Author |
|---|---|---|---|
| CSUnit Addin | Runs csUnit tests under NUnit without recompilation. | Addin | Charlie Poole |
| Common.Addin.Build | Common build script for use in building NUnit addins. | Addin | Charlie Poole |
| Extension Methods For Nunit | A DSL for constraint specification | Addon | Jonathan Knezek |
| FireBenchmarks | Performance testing addin for NUnit. | Addin | Federico Coletto |
| IterativeTest | Data-driven testing alternative. | Addin | Kelly Anderson |
| MSBuild-NUnit | MSBuild task to run NUnit | Runner | Rafael Teixeira & Paul Welter |
| NAnt-task | NAnt task to run NUnit | Runner | Daniel Nauck |
| Njasmine | A DSL for writing tests as Given/When/Then specifications, inspired by Jasmine. | Addin | Frank Schwieterman |
| Nunit-Results | Produces HTML reports from one or more NUnit test runs. | Extra | Charlie Poole |
| Nunit-summary | Produces HTML or text reports from one or more NUnit test runs. | Extra | Charlie Poole |
| Nunitex | NUnit constraint syntax based on extension methods | Addon | Fabio Maulo, Simone Busoli |
| ORAYLIS BI.Quality | ORAYLIS BI.Quality is a testing suite for BI solutions makes it easier to develop in an agile environment. The suite is based on NUnit and supports quite a lot of different testing methods. | Addon | Thomas Strehlow (ORAYLIS GmbH) |
| Rowtest | Allows writing mbUnit-style RowTests under NUnit | Addin | Andreas Schlapsi |
| TestDriven.Net | Zero friction unit testing extension for Visual Studio | Runner | Jamie Cansdale |
| VisualNunit | Open Source NUnit plugin for Visual Studio 2008 and 2010 | Runner | Tommi S. E. Laukkanen |
| Watin Test Recorder | Tool for use of WatiN with NUnit. | Extra | Daaron Dwyer, Nick Journals, James Avery |
| Xtunit | Rollback data changes made by a test. | Addin | Roy Osherove |
上面的表格中列出了NUnit官方给出的扩展工具，我比较关心的是能让我体面的写出测试的扩展。
NUnit Extension Method
var actual =2.5;
actual.Should(Be.EqualTo(2.5).Within(0.5));
个人感觉不是很好，例子里面层层嵌套，很不习惯，我更倾向于actual.shouldBe(2.5).Within(0.5)
Njasmine
一种我看不懂的测试写法，作者说是rspec风格，我怎么看着不像。。。从名字上面看，和jasmine有着千丝万缕的联系
NUnitex
很强大的一种测试方法扩展，支持NUnit，XUnit，MSTest，这下大家满意了吧。。。
文章作者说：Charlie Poole, NUnit’s project leader, included NUnitEx as official NUnit AddOns “under review for possible inclusion in NUnit 3.0” (thanks Charlie) and we are looking for some response from users (the thread is here).也就是说TA是被NUnit组织推荐的
真实性我就很难验证了。
一些典型的验证方法：
actual.Should().Be.True();
actual.Should().Be.EqualTo(something);actual.Should().Be.InstanceOf<SomeClass>();
var something =newobject();
something.Should()
.Not.Be.Null()
.And
.Not.Be.EqualTo(newobject());
minvalue.Should().Be.LessThanOrEqualTo(minvalue +1);actual.Should().Be.SubsetOf(new[]{1,2,3,4});
我认为最牛逼的就是TA居然支持LinQ形式的验证
new[]{1,2}.Should().Satisfy(x => x.SequenceEqual(new[]{1,2}));
这难道不酷么？
引用资料：
http://www.nunit.org/wiki/doku.php?id=nunit:extensions
http://code.google.com/p/nunitex/wiki/SyntaxOverview