Add abort logic

Author: bclothier

Rubberduck.Core/UnitTesting/ProjectTestExtensions.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Runtime.InteropServices;
-using System.IO;
 using System.Reflection;
 using Microsoft.Win32;
 using Rubberduck.VBEditor.SafeComWrappers.Abstract;

Rubberduck.Core/UnitTesting/TestEngine.cs

@@ -52,6 +52,13 @@ private void StateChangedHandler(object sender, ParserStateEventArgs e)
                     RunInternal(_tests);
                 });
             }
+
+            if (_testRequested && (e.State == ParserState.ResolverError || 
+                                   e.State == ParserState.Error ||
+                                   e.State == ParserState.UnexpectedError))
+            {
+                _testRequested = false;
+            }
         }
 
         public TestExplorerModel Model { get; }