title: Running unit tests with .NET Core MSTest: "The following TestContainer was not found..."
body: <p>I've searched high and low and can't find answer to this Exception. <a href="https://stackoverflow.com/q/5481120/8534588">This question</a> is the main one to come up when I search, but it doesn't address this issue. </p>
  
  <pre><code>[7/8/2018 6:22:22 PM Informational] Executing test method 'CoreScraper.FlyerScraper.GetAllCurrentFlyers'
  [7/8/2018 6:22:22 PM Error] System.InvalidOperationException: The following TestContainer was not found 'C:\Users\Username\Documents\Visual Studio 2017\Projects\ProductApp\CoreScraper\bin\Debug\netcoreapp2.0\CoreScraper.dll'
     at Microsoft.VisualStudio.TestWindow.Controller.TestContainerProvider.&lt;GetTestContainerAsync&gt;d__61.MoveNext()
  </code></pre>
  
  <p>"CoreScraper" is the name of the project. When I look in that <code>...\netcoreapp2.0\</code> folder, the CoreScraper.dll is definitely in there. I am running the test by right-clicking in the test method and selecting "Run Tests". The test ran fine the very first time I ran it, but it has given me this error ever since. I've closed out of Visual Studio and reopened, deleted the contents of <code>bin\</code>, cleaned and rebuilt the project, etc.</p>