How to run SpecFlow tests in Visual Studio 2010?

If you want to be able to run your tests directly from Visual Studio 2010 without any additional tools or extensions than you should configure SpecFlow to use MsTest as its unit test framework.

This can be done in your application configuration file with the following:

  <configSections> 
    <section 
       name="specFlow" 
       type="TechTalk.SpecFlow.Configuration.ConfigurationSectionHandler, TechTalk.SpecFlow"/> 
  </configSections> 
  <specFlow> 
    <unitTestProvider name="MsTest" /> 
    <!--
        Use this if you're running VS2010
        <unitTestProvider name="MsTest.2010" />
    -->
  </specFlow> 

The generated code-behind file will then contain MsTest tests that are recognisable by Visual Studio and can be run with the build-it test runner.

No need to use NUnit at all.