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Capturing Human Intelligence - ApprovalTests is an open source assertion/verification library to aid unit testing.

It is compatible with most .Net unit testing frameworks (Nunit, MsTest, Xunit, MBUnit)

What can it be used for?

Approval Tests can be used for verifying objects that require more than a simple assert. They also come prepackaged with utilities for some common .Net scenarios including

  • Dictionaries & Collections
  • Long Strings
  • Log Files
  • Asp.Net
  • Asp.Net Mvc
  • Winforms
  • Wpf
  • Entity Framework
  • Rdlc reports

Video Tutorials

You can watch a bunch of short videos on getting started and using ApprovalTests in .Net at YouTube


If you prefer auditory learning, you might enjoy the following podcast

Available on NuGet

Install-Package ApprovalTests

Nightly (CI) Builds available at

ApprovalTests Nightly Build Status

ApprovalTests on the MyGet Gallery Note: Select "Include Prerelease" instead of "Stable Only" (-IncludePrerelease in powershell)


Sample Code

	public class SampleTest
		public void TestList()
			var names = new[] {"Llewellyn", "James", "Dan", "Jason", "Katrina"};
			Approvals.VerifyAll(names, "");

Will Produce a File

[0] = Dan
[1] = James
[2] = Jason
[3] = Katrina
[4] = Llewellyn

Simply rename this to SampleTest.TestList.approved.txt and the test will now pass.

Approved File Artifacts

The *.approved.* files must be checked into source your source control. ApprovalTests now ignores line endings by default (so you can remove *.approved.* binary from your .gitattributes file if you added previously).

If you would like to verify line endings, simply add [assembly: IgnoreLineEndingsAttribute(false)] to your AssemblyInfo.cs

Do not add *.received.* files to your source control (they are transitory, and some SCMs like TFS will lock them or mark them read-only, which will break every dependent test).

More Info


Apache 2.0 License


ask on twitter: @LlewellynFalco or #ApprovalTests