title: Why does nunit not run a test which contains control/special chars
body: <p>If I have a test class like</p>
  <pre class="lang-cs prettyprint-override"><code>public class Tests
  {
      [TestCaseSource(nameof(TestSource))]
      public void Test(string c)
      {
          Assert.Pass();
      }
  
      public static IEnumerable&lt;object&gt; TestSource()
      {
          for (char c = '\0'; c &lt; 255; c++)
          {
              yield return c.ToString();
          }
      }
  }
  </code></pre>
  <p>then the test runner in the Visual Studio can discover all the tests but doesn't run all of them.</p>
  <p>these are the ascii character ranges that are not running:</p>
  <pre><code>U_0001 - U_0006
  U_000E - U_001F
  U_007F - U_0084
  U_0086 - U_009F
  </code></pre>
  <p>We currently use some of these characters like <code>U_0002</code> for network work related test which are included in the test but currently do not run</p>
  <p>This is the output for the test run</p>
  <pre><code>---------- Starting test discovery for requested test run ----------
  NUnit Adapter 3.17.0.0: Test discovery starting
  NUnit Adapter 3.17.0.0: Test discovery complete
  ========== Test discovery finished: 255 Tests found in 4,8 sec ==========
  ---------- Starting test run ----------
  NUnit Adapter 3.17.0.0: Test execution started
  Running selected tests in C:\Users\WEIK014\source\repos\TestSourceTestProject\TestSourceTestProject\bin\Debug\netcoreapp2.1\TestSourceTestProject.dll
     NUnit3TestExecutor discovered 199 of 199 NUnit test cases
  NUnit Adapter 3.17.0.0: Test execution complete
  ========== Test run finished: 199 Tests run in 8,6 sec (199 Passed, 0 Failed, 0 Skipped) ==========
  </code></pre>
  <p>as you see it doesn't even recognize that it skips tests.</p>
  <p>Versions in the project:</p>
  <ul>
  <li>Project .Net Core 2.1</li>
  <li>NUnit 3.13.1</li>
  <li>NUnit3TestAdapter 3.17.0</li>
  </ul>
  <p>Here is some visual proof that these test do not run
  <a href="https://i.stack.imgur.com/f8C8n.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f8C8n.png" alt="enter image description here" /></a></p>