Built tests are not added to the Visual Studio Test Explorer window

Question

1. I set up the SpecFlow plug-in for the Visual Studio 2013.
2. I created new Feature Item and build it.

Result: built test is not shown in the Test

Answer 1

I tried installing the Nugget package

SpecFlow.Tools.MsBuild.Generation

with the same version than specflow and now I can see the test in TestExplorer, other ways not works for me.

I already had installed 1 from

Nugget Package Specflow
Specflow.NUnit
Nunit
Nunit3TestAdapter

and the extension for Visual Studio for Specflow a NUnitTestAdapter