title: Can't find project classes/methods in test project
body: <p>In my namespace <code>Draughts</code> I have two projects, <code>Draughts</code> and <code>Draughts.UnitTests</code>. When I try to access <code>Draughts</code> methods/classes in <code>Draughts.UnitTests</code> it can't find anything at all. At the top of <code>Draughts.UnitTests</code> I put <code>using Draughts</code>. Any ideas?</p>
  
  <p>BoardUnitTests.cs</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using Draughts;
  using NUnit.Framework;
  
  namespace Draughts.UnitTests
  {
      public class BoardUnitTests
      {
          private Board GetBoard()
          {
              return true;
          }
  
          [Test]
          public void CheckValidBoardPosition_ValidPosition_ReturnsTrue()
          {
              Assert.AreEqual(1, 1);
          }
      }
  }
  </code></pre>
  
  <p>In the code above it can't recognize Board which is a class I have defined in <code>Draughts</code>.</p>
  
  <p>Here's a screenshot of my solution explorer:</p>
  
  <p><a href="https://i.stack.imgur.com/JINWB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/JINWB.png" alt="enter image description here"></a></p>