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剛看到這個(gè)Namespace的時(shí)候還以為是.Net Framework里自帶的包,結(jié)果查了一圈無(wú)任何結(jié)果。
果斷上Github,一擊即中https://github.com/tathamoddie/System.IO.Abstractions
先翻譯下開(kāi)發(fā)者給出的簡(jiǎn)單說(shuō)明,今后再慢慢使用
類(lèi)似于System.Web.Abstractions的用法,System.IO也被擴(kuò)展了,它能針對(duì)IO對(duì)象進(jìn)行訪(fǎng)問(wèn)
Just like System.Web.Abstractions, but for System.IO. Yay for testable IO access!
只能用NuGet方式下載
NuGet only:
Install-Package System.IO.Abstractions
如果有需要可以下載測(cè)試幫助包
and/or:
Install-Package System.IO.Abstractions.TestingHelpers
本庫(kù)最核心的2個(gè)文件是IFileSystem和FileSystem。使用IFileSystem.File.ReadAllText
等方法替換掉之前的File.ReadAllText等方法。其他API也基本完全相同,除了一些我們擴(kuò)展和進(jìn)行測(cè)試的方法。
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; // <summary>Create MyComponent with the given fileSystem implementation</summary> public MyComponent(IFileSystem fileSystem) { this.fileSystem = fileSystem; } /// <summary>Create MyComponent</summary> 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."); } } }
這個(gè)庫(kù)中還包含了一系列測(cè)試程序,來(lái)幫助你熟悉它。雖然它不是一個(gè)成熟的文件系統(tǒng),但是它一定會(huì)給你帶來(lái)幫助的。
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<string, MockFileData> { { @"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."); }
我們甚至支持把.NET框架里不可測(cè)試的類(lèi)型加入到測(cè)試程序里
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(); //... }
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