title: Tests not showing up in Test Explorer (Nunit)
body: <p><strong>The problem</strong>: My NUnit tests are not showing up in Test Explorer.</p>
  
  <p>I am currently running Visual Studio Express 2013 on a 64-bit machine. At present, I have "NUnit TestAdapter including NUnit 2.6.4 framework" installed. The framework version is 2.6.4.14350, while the test adapter version is 2.0.0.0</p>
  
  <p>Following these two threads (<a href="https://stackoverflow.com/questions/19298347/nunit-unit-tests-not-showing-in-test-explorer-with-test-adapter-is-installed">NUnit Unit tests not showing in Test Explorer with Test Adapter is installed</a> and <a href="https://stackoverflow.com/questions/25304425/visual-studio-2013-doesnt-discover-unit-tests">Visual Studio 2013 doesn&#39;t discover unit tests</a>) on troubleshooting:</p>
  
  <ul>
  <li><p>At present, "Active Solution Platform" is set to 64-bit for build
  settings for my test project (Build > Configuration Manager).</p></li>
  <li><p>"Default Processor Architecture" is pointed to 64-bit under Test >
  Test Settings.</p></li>
  <li><p>A reference to both NUnit framework and TestAdapter have been
  specified in the test project.</p></li>
  <li>The test project cs file contains <code>[TestFixture]</code> and <code>[Test]</code> in the correct places</li>
  <li>I have tried cleaning / rebuilding the solution multiple times</li>
  <li>I have tried restarting Visual Studio multiple times</li>
  <li>I have tried running Visual Studio via "Run as administrator"</li>
  <li>I have tried running NUnit version 3 (framework and test adapter)</li>
  </ul>
  
  <p>Below is my code:</p>
  
  <pre><code>using NUnit.Framework;
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  
  namespace Hello_World_Testing
  {
      [TestFixture]
      public class HelloWorldTesting
      {
          [Test]
          public void subtract()
          {
              int value = 1;
  
              if (value == 1)
              {
                  Assert.Pass();
              }
          }
  
          [Test]
          public void addition()
          {
              int firstValue = 1;
              int secondValue = 2;
  
              Assert.AreEqual(3, firstValue + secondValue);
          }
      }
  }
  </code></pre>