xUnit.net 1.1 Description:

In the 5 years since the release of NUnit 2.0, there have been millions of lines of code written using the various unit testing frameworks for .NET. About a year ago it became clear to myself and Brad Wilson that there were some very clear patterns of success (and failure) with the tools we were using for writing tests. Rather than repeating guidance about "do X" or "don't do Y", it seemed like it was the right time to reconsider the framework itself and see if we could codify some of those rules.

Additionally, the .NET framework itself has evolved a lot since its v1 release in early 2002. Being able to leverage some of the new framework features can help us write clearer tests.

Another aspect of change that we wanted to affect was bringing the testing framework more closely in line with the .NET platform. Many of the decisions we made, which we enumerate below, were driven by this desire. We wanted an architecture which is built for programmer testing (specifically Test-Driven Development), but can also be very easily extended to support other kinds of testing (like automated acceptance tests).

Finally, there have been advances in other unit test library implementations that have not really surfaced in the .NET community.

While any one of these reasons would not necessarily have been sufficient to create a new testing framework, the combination of them all made us want to undertake a new project: xUnit.net.

The xUnit.net framework will let you add type-specific comparison support for the more common asserts (like Equal and NotEqual).

xUnit.net 1.1 Features:

· Use of Generics
· The addition to generics to .NET 2.0 allowed much more concise assertions, allowing us to add type-specific comparison support for the more common asserts (like Equal and NotEqual).

· Anonymous Delegates.
Support for anonymous delegates in .NET 2.0 made the syntax for Assert.Throws much more compact and readable. Here are two examples of Assert.Throws:
· Assert.Throws(delegate { operation(); }); // VS 2005
· Assert.Throws(() => operation()); // VS 2008

· Assert extensibility
· Through the use of custom comparers (that implement IComparer), you can extend the concepts of Equal, NotEqual, Contains, DoesNotContain, InRange, and NotInRange for your tests.

· Test method extensibility
· The definition of how to run a test method can be extended. There are two example of this: the first, in xunitext.dll, is the [Theory] attribute which allows data-driven tests; the second, in the samples, is the [RepeatTest] attribute which runs a test method multiple times in a row. For more information on data theories, see http://shareandenjoy.saff.net/2006/12/new-paper-practice-of-theories.html.

· Test class extensibility
· The definition of run to run a test class can be extended. There is an example of this in xunitext.nunit.dll, the [RunWithNUnit] attribute which allows you to have mixed xUnit.net and NUnit tests in the same assembly, all executable by any xUnit.net runner.
· Version independent runner support. All of the runners in v1.0 (except the ReSharper runner) are written in a version-independent manner. This means that they have no dependencies on xunit.dll itself, and so a single copy of the runner should be able to run any current or future versions of tests. They will utilize the version of xunit.dll that is present in the same directory as the assembly under test. Third party runner authors are highly encouraged to use the version independent runner support library (xunit.runner.utility.dll).

xUnit.net 1.1 Requirements:

· Visual Studio

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