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NSpec.VsAdapter is a test adapter to run NSpec tests from Test Explorer in Visual Studio. It runs tests from projects targeting classic .NET Framework. It is available both as a Visual Studio Extension (for VS 2013, 2015) as well as a NuGet Package (for VS 2017). VS Extension for 2017 is under development.

Minimum requirements

It currently supports test projects targeting .NET Framework 4.5 and later, and NSpec 1.0.x.

As an extension, it can work in Visual Studio 2013 and 2015, Community Edition and above. As a NuGet package, it can work in Visual Studio 2017, Community Edition and above.

NOTE: To work with old project.json-based .NET Core projects, please try dotnet-test-nspec runner. Support for MSBuild-based .NET Core projects is under development. Again, support for VS 2017 Extension is under development as well.




Open Extensions and Updates window from within Visual Studio and type nspec vs in search field, then download this extension showing on top. That's it.

When you want to install this extension on more than one Visual Studio version at once, or when you don't have Visual Studio already open, you can browse to this extension page on Visual Studio marketplace, download it locally to your machine and double click on grabbed VSIX file.

NuGet Package

Proceed as for any other package. You can open Manage NuGet Packages ... from a project or solution and look for NSpec.VsAdapter in search field. Or you can open Package Manager Console and run Install-Package NSpec.VsAdapter -ProjectName <YourProjectName>.

In order to pick tests for whole solution, it is enough to install this package in just one of your projects.


Open a solution in Visual Studio with at least one NSpec test project, then build all. Open VS Test Explorer window and wait until list gets populated with test specifications from all projects. Click on Run All or select some tests to be run. You can also group specifications based on project, or nspec-derived class, or trait.


See under examples/:

  • NetFrameworkSample
    Sample solution showing how a NSpec test project targeting .NET Framework is setup


This Visual Studio test adapter can be configured by using a .runsettings file (see MSDN). Currently supported file format is:

<?xml version="1.0" encoding="utf-8"?>

  <!-- other configurations -->

  <!-- NSpec VS Adapter -->


Currently supported settings are:

Name Type Values Description
LogLevel String Trace, Debug, Info, Warn, Error Minimum log level to show. Log messages with a level lower than this will not be shown.

An example of such a file can be found in test source code at sln/test/Samples/samples.runsettings.

Breaking changes

To check for potential breaking changes, see


See CONTRIBUTING doc page.




NSpec.VsAdapter is written by BrainCrumbz. It's shaped and benefited by hard work from our contributors.


A test adapter to run NSpec tests from Test Explorer in Visual Studio 2013 and later.



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