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POVS2008 UnitTesting - detached RCW with Office Application objects (PowerPoint, etc.)
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copied!<h2>BACKGROUND</h2> <ul> <li>I am automating an PowerPoint 2007 via C#</li> <li>I am writing unittests using the built-in unit testing of Visual Studio (Microsoft.VisualStudio.TestTools.UnitTesting) for my code</li> <li>I am well relatively experienced in automating the Office 2007 apps</li> </ul> <h2>MY PROBLEM</h2> <ul> <li>When I run my unit tests, the first unit test method runs fine, all after that have an error concerning a detached RCW</li> <li>I am creating a static instance of PowerPoint for the test methods to share, but it seems like the application RCW is getting detached after the first test method is run</li> </ul> <h2>THE SOURCE CODE</h2> <pre><code> using System; using System.Text; using System.Collections.Generic; using System.Linq; using Microsoft.VisualStudio.TestTools.UnitTesting; namespace TestDemo { [TestClass] public class UnitTest1 { private static Microsoft.Office.Interop.PowerPoint.ApplicationClass g_app = new Microsoft.Office.Interop.PowerPoint.ApplicationClass(); private TestContext testContextInstance; public TestContext TestContext { get { return testContextInstance; } set { testContextInstance = value; } } [TestMethod] public void Test01() { g_app.Visible = Microsoft.Office.Core.MsoTriState.msoCTrue; } [TestMethod] public void Test02() { g_app.Visible = Microsoft.Office.Core.MsoTriState.msoCTrue; } } } </code></pre> <h2>THE ERROR MESSAGE</h2> <pre><code>Test method TestDemo.UnitTest1.Test02 threw exception: System.Runtime.InteropServices.InvalidComObjectException: COM object that has been separated from its underlying RCW cannot be used.. </code></pre> <p>This message comes on the line where the PowerPoint instance is used (when I set the Visible property)</p> <h2>WHAT I HAVE TRIED</h2> <ul> <li>The order of the unittests does not change the behavior</li> <li>The same problem occurs with Word 2007, Visio 2007, etc.</li> <li>When writing testcases with NUNIT I don't get these problem - obviously something is different about how visual studio runs unit tests (not implying VS is incorrect, just pointing out it is different from NUNIT)</li> <li>It has nothing to do with the Visible property - any usage of a method or property will cause this issue</li> <li>I have tried using the attributes AssemblyInitialize and ClassInitialize to create the instance but nothing has worked </li> <li>Googled & Binged - no clear answer that helps me</li> </ul> <h2>COMMENTS</h2> <ul> <li>I could switch to NUNIT, but would prefer to keep using Visual Studio's native unit test framework </li> </ul> <h2>MY QUESTION</h2> <ul> <li>How can I successfully create an single instance of PowerPoint 2007 that will be shared among all the TestMethods</li> <li>If you can provide insight into <em>why</em> this is happening, I would be grateful.</li> </ul> <h2>SOLVED (THANKS TO ALCONJA)</h2> <ul> <li>I followed his advice to modify the .testrunconfig and it worked. </li> </ul> <h2>LINKS</h2> <ul> <li><a href="http://blogs.msdn.com/martijnh/archive/2009/12/31/unit-testing-com-object-that-has-been-separated-from-its-underlying-rcw-cannot-be-used.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/martijnh/archive/2009/12/31/unit-testing-com-object-that-has-been-separated-from-its-underlying-rcw-cannot-be-used.aspx</a></li> </ul>

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