System.IO.Abstractions.TestingHelpers 17.2.3

.NET 5.0 .NET Standard 2.0 .NET Framework 4.6.1
NuGet\Install-Package System.IO.Abstractions.TestingHelpers -Version 17.2.3
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
dotnet add package System.IO.Abstractions.TestingHelpers --version 17.2.3
<PackageReference Include="System.IO.Abstractions.TestingHelpers" Version="17.2.3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add System.IO.Abstractions.TestingHelpers --version 17.2.3
#r "nuget: System.IO.Abstractions.TestingHelpers, 17.2.3"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install System.IO.Abstractions.TestingHelpers as a Cake Addin
#addin nuget:?package=System.IO.Abstractions.TestingHelpers&version=17.2.3

// Install System.IO.Abstractions.TestingHelpers as a Cake Tool
#tool nuget:?package=System.IO.Abstractions.TestingHelpers&version=17.2.3

System.IO.Abstractions NuGet Continuous Integration Codacy Badge Renovate enabled FOSSA Status

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.

dotnet add package System.IO.Abstractions
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.");
        }
    }
}

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.

dotnet add package System.IO.Abstractions.TestingHelpers
[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\image.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.");
}

We even support casting from the .NET Framework's untestable types to our testable wrappers:

FileInfo SomeApiMethodThatReturnsFileInfo()
{
    return new FileInfo("a");
}

void MyFancyMethod()
{
    var testableFileInfo = (FileInfoBase)SomeApiMethodThatReturnsFileInfo();
    ...
}

Since version 4.0 the top-level APIs expose interfaces instead of abstract base classes (these still exist, though), allowing you to completely mock the file system. Here's a small example, using Moq:

[Test]
public void Test1()
{
    var watcher = Mock.Of<IFileSystemWatcher>();
    var file = Mock.Of<IFile>();

    Mock.Get(file).Setup(f => f.Exists(It.IsAny<string>())).Returns(true);
    Mock.Get(file).Setup(f => f.ReadAllText(It.IsAny<string>())).Throws<OutOfMemoryException>();

    var unitUnderTest = new SomeClassUsingFileSystemWatcher(watcher, file);

    Assert.Throws<OutOfMemoryException>(() => {
        Mock.Get(watcher).Raise(w => w.Created += null, new System.IO.FileSystemEventArgs(System.IO.WatcherChangeTypes.Created, @"C:\Some\Directory", "Some.File"));
    });

    Mock.Get(file).Verify(f => f.Exists(It.IsAny<string>()), Times.Once);

    Assert.True(unitUnderTest.FileWasCreated);
}

public class SomeClassUsingFileSystemWatcher
{
    private readonly IFileSystemWatcher _watcher;
    private readonly IFile _file;

    public bool FileWasCreated { get; private set; }

    public SomeClassUsingFileSystemWatcher(IFileSystemWatcher watcher, IFile file)
    {
        this._file = file;
        this._watcher = watcher;
        this._watcher.Created += Watcher_Created;
    }

    private void Watcher_Created(object sender, System.IO.FileSystemEventArgs e)
    {
        FileWasCreated = true;

        if(_file.Exists(e.FullPath))
        {
            var text = _file.ReadAllText(e.FullPath);
        }
    }
}
Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (8)

Showing the top 5 NuGet packages that depend on System.IO.Abstractions.TestingHelpers:

Package Downloads
Reo.Core.Testing

Package Description

Glob.cs

File system path globbing library (wildcards like in bash).

Noggog.Testing

Package Description

CreativeCoders.UnitTests

Package Description

FastMoq

Easy and fast extension of the famous Moq mocking framework for mocking and auto injection of classes.

GitHub repositories (34)

Showing the top 5 popular GitHub repositories that depend on System.IO.Abstractions.TestingHelpers:

Repository Stars
microsoft/PowerToys
Windows system utilities to maximize productivity
gitextensions/gitextensions
Git Extensions is a standalone UI tool for managing git repositories. It also integrates with Windows Explorer and Microsoft Visual Studio (2015/2017/2019).
JosefNemec/Playnite
Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface for your games.
projectkudu/kudu
Kudu is the engine behind git/hg deployments, WebJobs, and various other features in Azure Web Sites. It can also run outside of Azure.
Lidarr/Lidarr
Looks and smells like Sonarr but made for music.
Version Downloads Last updated
17.2.3 6,693 9/16/2022
17.2.1 7,745 9/10/2022
17.1.1 37,867 8/15/2022
17.0.28 295 8/15/2022
17.0.24 65,454 7/19/2022
17.0.23 5,571 7/15/2022
17.0.21 18,448 7/4/2022
17.0.18 62,255 6/9/2022
17.0.15 43,856 5/20/2022
17.0.14 9,575 5/18/2022
17.0.13 4,904 5/17/2022
17.0.12 5,728 5/16/2022
17.0.11 1,517 5/15/2022
17.0.10 30,506 5/12/2022
17.0.9 489 5/11/2022
17.0.8 630 5/11/2022
17.0.7 127 5/11/2022
17.0.6 135 5/11/2022
17.0.5 118 5/11/2022
17.0.4 14,966 5/11/2022
17.0.3 34,090 4/26/2022
17.0.2 154 4/26/2022
17.0.1 2,578 4/25/2022
16.1.26 14,113 4/24/2022
16.1.25 89,141 3/23/2022
16.1.24 8,252 3/22/2022
16.1.23 13,898 3/14/2022
16.1.22 1,617 3/11/2022
16.1.21 156 3/11/2022
16.1.20 10,916 3/8/2022
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16.1.18 130 3/8/2022
16.1.17 174 3/8/2022
16.1.16 8,131 3/3/2022
16.1.15 54,999 2/19/2022
16.1.14 132 2/19/2022
16.1.13 201 2/19/2022
16.1.12 135 2/19/2022
16.1.11 5,903 2/17/2022
16.1.10 50,374 2/4/2022
16.1.9 3,244 2/2/2022
16.1.8 153 2/2/2022
16.1.7 3,430 1/31/2022
16.1.6 171 1/31/2022
16.1.5 325 1/31/2022
16.1.4 92,271 1/12/2022
16.1.2 1,005 1/12/2022
16.1.1 3,952 1/11/2022
16.0.8 9,248 1/9/2022
16.0.7 1,691 1/8/2022
16.0.6 176 1/8/2022
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16.0.4 155 1/8/2022
16.0.3 2,014 1/6/2022
16.0.2 1,099 1/6/2022
16.0.1 121,701 12/22/2021
15.0.1 1,210 12/22/2021
14.0.13 46,117 12/11/2021
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14.0.11 349 12/11/2021
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14.0.7 265 12/10/2021
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14.0.3 58,420 11/27/2021
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13.2.43 89,851 7/27/2021
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13.2.40 1,343 7/14/2021
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13.2.38 72,935 6/15/2021
13.2.37 2,545 6/10/2021
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13.2.33 82,333 5/15/2021
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13.2.15 11,001 2/18/2021
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13.2.11 4,934 2/16/2021
13.2.10 79,484 2/10/2021
13.2.9 191,346 1/14/2021
13.2.8 59,051 12/22/2020
13.2.7 6,454 12/20/2020
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13.2.5 45,883 12/9/2020
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13.2.3 587 12/4/2020
13.2.2 49,563 11/26/2020
13.2.1 1,734 11/26/2020
13.1.2 436 11/25/2020
13.1.1 434 11/25/2020
13.0.1 28,874 11/21/2020
12.2.27 13,050 11/21/2020
12.2.26 1,253 11/20/2020
12.2.25 6,164 11/17/2020
12.2.24 6,103 11/15/2020
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12.2.22 506 11/14/2020
12.2.21 4,275 11/12/2020
12.2.20 383 11/12/2020
12.2.19 23,277 11/5/2020
12.2.7 47,725 10/15/2020
12.2.6 14,867 10/15/2020
12.2.5 4,025 10/12/2020
12.2.4 419 10/12/2020
12.2.3 47,923 10/12/2020
12.2.2 6,078 10/7/2020
12.2.1 68,006 9/28/2020
12.1.11 1,504 9/28/2020
12.1.10 5,858 9/24/2020
12.1.9 32,286 9/11/2020
12.1.2 409 9/11/2020
12.1.1 187,761 8/3/2020
12.0.13 4,015 8/2/2020
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12.0.9 11,991 7/21/2020
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11.0.17 3,019 6/19/2020
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11.0.7 56,190 5/28/2020
11.0.6 86,794 5/8/2020
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11.0.3 1,306 4/30/2020
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11.0.1 486 4/26/2020
10.0.10 8,953 4/20/2020
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10.0.8 31,518 4/7/2020
10.0.7 6,955 4/3/2020
10.0.6 11,013 4/1/2020
10.0.5 506 4/1/2020
10.0.4 499 4/1/2020
10.0.1 43,557 3/21/2020
9.0.6 4,530 3/19/2020
9.0.5 29,394 3/16/2020
9.0.4 131,280 2/18/2020
9.0.3 555 2/18/2020
9.0.2 8,250 2/11/2020
9.0.1 569 2/11/2020
8.1.1 851 2/11/2020
8.0.6 578 2/11/2020
8.0.5 29,230 1/29/2020
8.0.4 1,138 1/27/2020
8.0.3 9,585 1/19/2020
7.1.10 55,206 1/17/2020
7.1.8 556 1/17/2020
7.1.4 16,556 1/13/2020
7.1.3 33,387 1/6/2020
7.1.1 23,164 12/21/2019
7.0.16 3,619 12/19/2019
7.0.15 37,907 12/5/2019
7.0.7 115,142 10/21/2019
7.0.5 12,813 10/11/2019
7.0.4 167,159 9/29/2019
6.0.38 75,722 9/26/2019
6.0.36 1,931 9/24/2019
6.0.34 1,033 9/24/2019
6.0.32 29,102 9/9/2019
6.0.27 13,032 9/3/2019
6.0.25 643 9/2/2019
6.0.23 19,872 8/26/2019
6.0.21 45,492 8/12/2019
6.0.19 41,414 8/9/2019
6.0.17 7,383 8/5/2019
6.0.15 63,280 7/9/2019
6.0.14 20,599 6/29/2019
6.0.13 901 6/28/2019
6.0.11 15,190 6/21/2019
6.0.9 596 6/21/2019
6.0.7 12,943 6/16/2019
6.0.6 563 6/16/2019
6.0.5 2,176 6/13/2019
6.0.3 10,103 6/13/2019
6.0.1 63,791 6/7/2019
5.0.1 8,545 6/3/2019
4.2.17 1,978 5/30/2019
4.2.15 5,557 5/28/2019
4.2.13 35,142 5/15/2019
4.2.12 624 5/15/2019
4.2.10 19,640 5/10/2019
4.2.9 742 5/10/2019
4.2.8 23,320 4/28/2019
4.2.4 9,422 4/19/2019
4.1.6 73,691 4/9/2019
4.0.11 72,726 3/30/2019
3.1.1 36,208 3/10/2019
3.0.10 273,138 1/5/2019
3.0.2 55,413 12/7/2018
2.2.18-beta 597 12/3/2018
2.2.17-beta 582 12/2/2018
2.2.16-beta 548 12/1/2018
2.2.15-beta 597 12/1/2018
2.2.14-beta 561 12/1/2018
2.2.13-beta 633 12/1/2018
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2.2.11-beta 566 12/1/2018
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2.2.9-beta 679 11/16/2018
2.2.8-beta 636 11/9/2018
2.2.7-beta 614 11/5/2018
2.2.6-beta 629 10/30/2018
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2.2.4-beta 609 10/30/2018
2.2.3-beta 599 10/29/2018
2.2.2-beta 600 10/25/2018
2.1.0.256 105,673 10/20/2018
2.1.0.247 27,560 10/15/2018
2.1.0.237 3,536 10/14/2018
2.1.0.236 49,436 10/10/2018
2.1.0.235 17,617 10/8/2018
2.1.0.234 819 10/8/2018
2.1.0.233 2,209 10/6/2018
2.1.0.232 1,789 10/4/2018
2.1.0.231 19,811 9/19/2018
2.1.0.230 34,212 9/8/2018
2.1.0.229 1,829 9/6/2018
2.1.0.228 9,209 8/27/2018
2.1.0.227 53,084 8/16/2018
2.1.0.226 9,841 8/14/2018
2.1.0.217 2,177 8/10/2018
2.1.0.216 4,722 8/9/2018
2.1.0.215 4,271 8/6/2018
2.1.0.214 1,176 8/5/2018
2.1.0.213 947 8/4/2018
2.1.0.211 25,996 7/25/2018
2.1.0.210 3,575 7/21/2018
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2.1.0.208 3,219 7/17/2018
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2.1.0.206 11,418 7/15/2018
2.1.0.205 1,232 7/12/2018
2.1.0.204 1,084 7/11/2018
2.1.0.203 1,035 7/11/2018
2.1.0.202 1,193 7/10/2018
2.1.0.201 1,539 7/10/2018
2.1.0.200 1,339 7/9/2018
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2.1.0.198 1,776 7/8/2018
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2.1.0.178 208,543 1/11/2018
2.1.0.177 5,044 1/2/2018
2.1.0.176 10,190 12/8/2017
2.1.0.175 24,667 11/16/2017
2.1.0.174 23,321 11/7/2017
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2.1.0.171 1,451 11/4/2017
2.1.0.170 927 11/4/2017
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2.1.0.159 34,551 10/22/2017
2.0.0.143 461,929 4/7/2017
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2.0.0.140 12,315 1/17/2017
2.0.0.139 15,437 1/6/2017
2.0.0.138 22,222 11/17/2016
2.0.0.137 4,934 10/14/2016
2.0.0.136 2,519 10/1/2016
2.0.0.124 160,214 2/8/2016
2.0.0.123 7,862 12/29/2015
2.0.0.122 1,033 12/28/2015
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2.0.0.98 1,111 1/25/2015
1.4.0.93 8,504 1/25/2015
1.4.0.92 14,581 9/29/2014
1.4.0.89 1,049 9/29/2014
1.4.0.88 1,058 9/29/2014
1.4.0.87 1,434 9/21/2014
1.4.0.86 6,589 5/7/2014
1.4.0.85 2,223 4/23/2014
1.4.0.84 1,384 4/7/2014
1.4.0.83 1,627 3/24/2014
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1.4.0.81 4,975 3/17/2014
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1.4.0.79 5,626 3/10/2014
1.4.0.78 1,223 3/2/2014
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1.4.0.76 1,349 2/21/2014
1.4.0.75 1,185 2/20/2014
1.4.0.74 24,984 1/12/2014
1.4.0.73 1,241 12/22/2013
1.4.0.72 1,537 12/1/2013
1.4.0.71 1,119 12/1/2013
1.4.0.70 1,343 11/21/2013
1.4.0.69 1,229 11/20/2013
1.4.0.68 2,509 10/15/2013
1.4.0.67 1,121 10/15/2013
1.4.0.66 2,592 7/31/2013
1.4.0.65 1,780 7/9/2013
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1.4.0.53 1,187 4/25/2013
1.4.0.52 1,270 4/25/2013
1.4.0.51 1,210 4/22/2013
1.4.0.50 1,187 4/22/2013
1.4.0.49 1,393 4/11/2013
1.4.0.48 1,290 3/24/2013
1.4.0.47 1,246 3/24/2013
1.4.0.46 1,173 3/24/2013
1.4.0.45 1,189 3/24/2013
1.4.0.44 1,629 3/16/2013
1.4.0.43 1,179 3/16/2013
1.4.0.42 1,245 3/16/2013
1.4.0.41 1,249 3/6/2013
1.4.0.40 1,763 12/24/2012
1.4.0.39 1,239 12/23/2012
1.4.0.38 1,198 12/23/2012
1.4.0.37 2,113 11/29/2012
1.4.0.36 1,295 11/29/2012
1.4.0.35 1,606 9/25/2012
1.4.0.32 2,458 7/14/2012
1.4.0.31 1,234 7/14/2012
1.4.0.30 1,258 7/12/2012
1.4.0.29 1,219 7/12/2012
1.4.0.28 1,197 7/12/2012
1.4.0.27 1,209 7/12/2012
1.4.0.26 1,300 7/2/2012
1.4.0.25 1,251 7/2/2012
1.4.0.24 1,756 5/15/2012
1.4.0.23 1,624 4/25/2012
1.4.0.22 1,256 4/25/2012
1.4.0.21 1,211 4/25/2012
1.4.0.20 1,356 4/18/2012
1.4.0.19 1,257 4/18/2012
1.4.0.18 1,261 4/18/2012
1.4.0.17 1,263 4/18/2012
1.4.0.14 1,283 4/4/2012
1.4.0.13 1,547 3/27/2012
1.4.0.12 1,852 9/16/2011
1.4.0.11 1,416 9/16/2011
1.3.0 1,634 5/27/2011
1.2.0 2,412 5/26/2011