IO扩展控件(System.IO.Abstractions)
刚看到这个Namespace的时候还以为是.Net Framework里自带的包,结果查了一圈无任何结果。
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果断上Github,一击即中https://github.com/tathamoddie/System.IO.Abstractions
先翻译下开发者给出的简单说明,今后再慢慢使用
类似于System.Web.Abstractions的用法,System.IO也被扩展了,它能针对IO对象进行访问
Just like System.Web.Abstractions, but for System.IO. Yay for testable IO access!
只能用NuGet方式下载
NuGet only:
Install-Package System.IO.Abstractions
如果有需要可以下载测试帮助包
and/or:
Install-Package System.IO.Abstractions.TestingHelpers
本库最核心的2个文件是IFileSystem和FileSystem。使用IFileSystem.File.ReadAllText
等方法替换掉之前的File.ReadAllText等方法。其他API也基本完全相同,除了一些我们扩展和进行测试的方法。
At the core of the library is IFileSystem and FileSystem. Instead of calling methods like File.ReadAllText
directly, use IFileSystem.File.ReadAllText
. We have exactly the same API, except that ours is injectable and testable.
public class MyComponent { readonly IFileSystem fileSystem; //Create MyComponent with the given fileSystem implementation public MyComponent(IFileSystem fileSystem) { this.fileSystem = fileSystem; } ///Create MyComponent public MyComponent() : this( fileSystem: new FileSystem() //use default implementation which calls System.IO ) { } public void Validate() { foreach (var textFile in fileSystem.Directory.GetFiles(@"c:\", "*.txt", SearchOption.TopDirectoryOnly)) { var text = fileSystem.File.ReadAllText(textFile); if (text != "Testing is awesome.") throw new NotSupportedException("We can't go on together. It's not me, it's you."); } } }
这个库中还包含了一系列测试程序,来帮助你熟悉它。虽然它不是一个成熟的文件系统,但是它一定会给你带来帮助的。
The library also ships with a series of test helpers to save you from having to mock out every call, for basic scenarios. They are not a complete copy of a real-life file system, but they'll get you most of the way there.
[Test] public void MyComponent_Validate_ShouldThrowNotSupportedExceptionIfTestingIsNotAwesome() { // Arrange var fileSystem = new MockFileSystem(new Dictionary{ { @"c:\myfile.txt", new MockFileData("Testing is meh.") }, { @"c:\demo\jQuery.js", new MockFileData("some js") }, { @"c:\demo\p_w_picpath.gif", new MockFileData(new byte[] { 0x12, 0x34, 0x56, 0xd2 }) } }); var component = new MyComponent(fileSystem); try { // Act component.Validate(); } catch (NotSupportedException ex) { // Assert Assert.AreEqual("We can't go on together. It's not me, it's you.", ex.Message); return; } Assert.Fail("The expected exception was not thrown."); }
我们甚至支持把.NET框架里不可测试的类型加入到测试程序里
We even support casting from the .NET Framework's untestable types to our testable wrappers:
FileInfo SomeBadApiMethodThatReturnsFileInfo() { return new FileInfo("a"); } void MyFancyMethod() { var testableFileInfo = (FileInfoBase)SomeBadApiMethodThatReturnsFileInfo(); //... }
新闻名称:IO扩展控件(System.IO.Abstractions)
转载来源:http://pwwzsj.com/article/iijhge.html